Always be nice to your children. Teach them to do the right thing and not fight like cats and dogs. To fight more gently like with words.
My mother-in-law and I are a fine example for the kids at their impressive ages when they look up to us and before we look up to them.
Why they grow bigger every generation I don't know. But better treat them nice while THEY are the ones doing the looking up at you.
Also, always remember that these cute little fellers will be the very ones telling the doctor when to pull the plug on you.