When does it stop?

Sometimes parents wonder if their grown children still love them the same way they did when they were kids. I wouldn't know as I was never close with my mum, but I still miss my dad. I do have a lot of love for my mum but different.. I guess it's the maternal child relationship love. I wonder if all kids move into that phase when they grow up... What a bummer to the mother who was the most important person in the children's lives at one time.. Oh well, life goes on, love moves on..