Tie

You know you're not single anymore...when you have to show your son how to tie a tie...he watches carefully and then attempts the tie himself...a little short this time...do it again...a little long this time...one more time...that's perfect...You remember when your Dad showed you how to tie a tie and instead of undoing the knot, you kept the tie tied up...but your son undoes his knot and the next function in which he dresses up, he's got the tie tied just like you taught him...You're glad you have the opportunity to show him these little things in life.