My youngest son (3) and I were making chocolate chip cookies together the other day.  I said to him, "Just think, if you help me all these years to make cookies, you will be able to make cookies for your wife and kids when you grow up."  He said, "I'm not gonna have a wife."  I asked, "Why not?"  He said with all sincerity, "Because I have you."

Oh, how sweet!  I grabbed him and smothered him with kisses while he giggled.

I'll have to remind him of his comment in about 20 years.