10 Successful Little Sibling Rivalries

A little competition between siblings can do wonders for personal motivation, and these celebs prove it. Root for your favorite Scott brother when the related renovation experts go head-to-head in Brother vs Brother, premiering July 21 at 10:00 PM only on HGTV.

1. Stephen and Alec Baldwin

Andrew H. Walker, Getty / Andreas Rentz / Getty Images

Rival occupation: Acting.

Age difference: Eight years. Stephen is 47 and Alec is 55.

Clear winner: Based on awards won, Alec wins by leaps and bounds.

2. Venus and Serena Williams

Stephen Morton / AP

Rival occupation: Professional tennis.

Age difference: Venus is 33 and sister Serena is 31.

Clear winner: Serena, who currently holds 51 titles versus her sister's 44.

3. Emilio Estevez and Charlie Sheen

Michael Loccisano, Getty / Jason Merritt / Getty Images

Rival occupation: Acting.

Age difference: Four years - Emilio is 51 and Charlie is 47.

Clear winner: Though Charlie is more of a household name, Emilio has won several prestigious awards. No clear #winning here.

4. Liam and Chris Hemsworth

Jason Merritt, Getty / Brendon Thorne / Getty Images

Rival occupation: Acting.

Age difference: The Hemsworth brothers are six years apart. Liam is 23, Chris is 29.

Clear winner: Both brothers have been featured in blockbuster films, so no clear winner here.

5. Kate and Rooney Mara

Dimitrios Kambouris, Getty / Bryan Bedder / Getty Images

Rival occupation: Acting.

Age difference: Kate is 30 and Rooney is 28.

Clear winner: Rooney's roles in The Girl with the Dragon Tattoo and The Social Network earned her dozens of award nominations and eight wins, giving her a slight edge here.

6. Jake and Maggie Gyllenhaal

Neilson Barnard, Getty / Neilson Barnard / Getty Images

Rival occupation: Acting.

Age difference: Three years - Jake is 32 and Maggie is 35.

Clear winner: The Gyllenhaals have received numerous accolades for their work in several successful films. These two are both winners.

7. Jessica and Ashlee Simpson

Jamie McCarthy / Getty Images

Rival occupation: Singing, acting.

Age difference: Jessica is 32, four years older than Ashlee, who is 28.

Clear winner: Both have had success in the music and reality TV worlds, but Jessica's foray into the fashion world has given her an edge. According to celebrity net worth estimates, Jessica's fortune is 10 times larger than Ashlee's.

8. Eli and Peyton Manning

Gerry Broome / AP

Rival occupation: Professional football.

Age difference: Eli is 32 and Peyton is 37.

Clear winner: Peyton has won four Most Valuable Player awards versus Eli's two, but Eli has time to catch up.

9. Elle and Dakota Fanning

Jason Merritt / Getty Images

Rival occupation: Acting.

Age difference: Elle is 15, and Dakota is 19.

Clear winner: The young actresses have both experienced great success in their short lives, along with award nominations and wins.

10. Marcus and Markieff Morris

Christian Petersen / Getty Images

Rival occupation: Professional basketball.

Age difference: Marcus and Markieff are 23-year-old twins.

Clear winner: The twins currently play for the Phoenix Suns - Marcus as a forward and Markieff as a power forward. Markieff's points per game average is slightly higher than Marcus's so far.

Inspired by Brother vs. Brother, premiering July 21 at 10:00 PM only on HGTV.