I'm in the thick of it right now as a serial founder with a 5 and a 1 year old. One thing I'm surprised paulg didn't touch on is how much it can evolve your relationship with your partner (for the better!).

Watching my wife have special moments with our kids fills my heart like nothing else.

Seeing her be an amazing mom is like watching your cofounder take on a completely new role outside of their previous experience and crush it. Except it's even better since you're in love with them and have all these biological/chemical signals to help kick that in high gear.