There have been many successful pairs of brothers throughout the history of professional football.
The Nevilles, Laudrups and De Boers are three of the most famous, while the Alcantara brothers - Thiago and Rafinha - are probably the most well-known among active footballers.
Both players are stars of European football, the former being one of the best midfielders on the planet.
But how do the pair rank in terms of transfer fees accrued by both siblings? Surprisingly, not very highly.
Thiago's moves to Bayern Munich and Liverpool come to a total of €47m, while Rafinha's transfer to Paris Saint-Germain this summer cost the French club just €1.5m - a collective sum of €48.5m.
Thanks to Transfermarkt, we can reveal to you the 27 most expensive pairs of brothers in the history of football.
Let's see who takes the number one spot...
27. Thiago (€47m) & Rafinha (€1.5m) Alcantara
Total transfer fees: €48.5m
The Alcantaras have to make do with a 27th-place finish...
26. Sebastien (€49.8m) & Nicolas (€500k) Frey
Total transfer fees: €50.3m
Sebastien played as a goalkeeper, most famously for Parma and Fiorentina. Nicolas is still an active player, having most recently featured for Chievo Verona.
25. Thomas Partey (€50m) & Francis Narh (€500k)
Total transfer fees: €50.5m
Arsenal's new midfield general has a younger brother who plays for Belarusian side FC Slavia Mozyr.
24. Mauro (€48.8m) and Sergio (€2.3m) Zarate
Total transfer fees: €51.1m
Mauro - who previously played for West Ham - is now at Boca Juniors, while Sergio retired from the sport back in 2003.
23. Michy Batshuayi (€50.65m) & Aaron Leya Iseka (€1.25m)
Total transfer fees: €51.9m
Crystal Palace striker Batshuayi has a younger brother who plays in the same position for FC Metz.
22. Nordin (€33.8m) & Sofyan (€20.5m) Amrabat
Total transfer fees: €54.3m
Both Amrabat brothers play for the Moroccan national team. Nordin is currently with Al-Nassr at club level, while Sofyan is at Fiorentina.
21. Gini Wijnaldum (€52.5m) & Rajiv van la Parra (€2.1m)
Total transfer fees: €54.6m
Who knew these two were related?! Wijnaldum and Van la Parra are half brothers, the latter currently a free agent.
20. Dejan (€55.3m) & Davor (€800k) Lovren
Total transfer fees: €56.1m
Dejan is now with Zenit, while the former Liverpool defender's brother currently plays for Fortuna Dusseldorf in the German second-tier.
19. Mario (€59m) & Fabian Gotze (€250k)
Total transfer fees: €59.25m
Mario is now with PSV after leaving Borussia Dortmund this summer. His brother Fabian is without a club.
18. Xabi (€59.5m) & Mikel (€500k) Alonso
Total transfer fees: €60m
Xabi, formerly of Liverpool, Real Madrid and Bayern Munich, is now retired, as is his brother Mikel - who spent the majority of his career at Real Sociedad.
17. Anthony (€65m) & Johan (€800k) Martial
Total transfer fees: €65.8m
Anthony's 29-year-old brother currently plays for Ligue 2 side Sochaux.
16. Yaya (€49.2m) & Kolo (€18.9m) Toure
Total transfer fees: €68.1m
A very famous pair of footballing brothers. Kolo is now a first-team coach at Leicester, while Yaya is a free agent.
15. Kevin-Prince (€44.2m) & Jerome (€27.1m) Boateng
Total transfer fees: €71.3m
Jerome is still a key man at Bayern Munich. Kevin-Prince's career has been on the decline for some time and he's now at Serie B side Monza.
14. Diego (€48m) & Gabriel (€23.5m) Milito
Total transfer fees: €71.5m
Both Argentines have now retired from the game. Diego is most famous for his spell at Inter Milan, while Gabriel spent four years at Barcelona.
13. Andre (€46.9m) & Jordan (€24.6m) Ayew
Total transfer fees: €71.5m
Andre is one of the best players in the Championship with Swansea and Jordan is a first-team regular at Palace.
12. Kaka (€77.3m) & Digao (€500k)
Total transfer fees: €77.8m
Digao played for AC Milan alongside his older brother. The central defender retired back in 2013.
11. Samuel (€78.5m) & David (€500k) Eto'o
Total transfer fees: €79m
Samuel - one of the greatest strikers of all time - retired last year. David is still an active player at Cameroonian side Eding Sport FC.
10. Nemanja (€76.5m) & Uros (€3m) Matic
Total transfer fees: €79.5m
Nemanja's 30-year-old brother plays as a midfielder for Qarabag in the Azerbaijan Premier League.
9. Abdou (€65m) & Ibrahima (€17m) Diallo
Total transfer fees: €82m
Abdou currently plays as a central defender for PSG. Ibrahima, a midfielder by trade, completed a move to Southampton this summer.
8. Rio (€72m) & Anton (€11.1m) Ferdinand
Total transfer fees: €83.1m
Rio retired back in 2015, but Anton is still going. He's currently a free agent, having most recently played for St Mirren.
7. Christian (€87.7m) & Jonathan Benteke (€100k)
Total transfer fees: €87.8m
Christian's younger brother currently plays as a forward for Belgian club URSL Vise.
6. Paul (€105m) & Florentin (€500k) Pogba
Total transfer fees: €105.5m
Paul's brother is currently at Sochaux alongside Martial's sibling. Florentin is also a member of the Guinean national team.
5. Lucas (€80m) & Theo (€44m) Hernandez
Total transfer fees: €124m
Both Hernandez's are two of the best defenders around. Lucas is a key man at Bayern, while Theo is arguably the best left-back in Serie A with AC Milan.
4. Kylian Mbappe (€135m) & Jires Kembo-Ekoko (€3.7m)
Total transfer fees: €138.7m
The world's second most expensive player has an adopted brother who plays as a striker for Turkish club Bursaspor.
3. Gonzalo (€159m) & Federico (€2.6m) Higuain
Total transfer fees: €161.6m
The two Argentines are both with David Beckham's Inter Miami, the only brothers on this list who play for the same team.
2. Eden (€150m) & Thorgan (€35.5m) Hazard
Total transfer fees: €185.5m
Two of Belgium's best. Eden is at Real Madrid, while Thorgan is on Borussia Dortmund's books.
1. Romelu (€212.6m) & Jordan (€4m) Lukaku
Total transfer fees: €216.6m
The only pair of brothers to cost over €200m as a pair, mostly thanks to Romelu's big-money moves to Manchester United and Inter Milan.