By now you know that Jim Harbaugh – the head coach of the Los Angeles Chargers – and John Harbaugh (his counterpart in charge of the Baltimore Ravens) are brothers.

You DID know that, right? They have supported each other throughout their careers, and now that Jim is back in the NFL, their teams will play each other again like they did in Super Bowl 47.

With all that history and family ties, it’s a good time to answer all your questions about the Harbaugh brothers. Here are some questions and answers you may need to know:

How old are Jim and John Harbaugh? Who is Harbaugh’s older brother?

John is 15 months older: he is 62 years old. Jimmy is 60.

How do the Harbaughs stack up against each other?

John leads Jim 2-0. The Ravens defeated Jim’s 49ers in 2011 and in the aforementioned Super Bowl matchup in 2013.

Which players played for both Harbaughs?

A partial list:

1. JK Dobbins

2. Gus Edwards

3. Kyle Van Noy

4. David Ojabo

5. Josh Johnson

6. Tavares Gooden

7. Bradley Bozeman

8. Hayden Hurst

Did John Harbaugh play in the NFL?

No. He played for Miami (Ohio) in college.

Did Jim Harbaugh play in the NFL?

Certainly. He was a quarterback for 14 years, with stops with the Bears, Colts, Ravens and Chargers.