At 3 years we say "mummy I love you" At 14 years we say "mum whatever, At 16 years we say "my mum is so annoying!" At 18 years we say "I'm leaving this house", At 21 we say"mum,you were right", At 30 years we say "I want to go to mums house" At 50 years we say " I don't want to lose my mum" , At 70 we say "I would give up everything to have my mum here with me", you only have one mum.