Personally I think the term is "IMPORTANT" because that's what you are to them. Your children are part of you and you are part of them that will never change .My children grew up calling me by my first name I don't know why they just did and they still do to this day and they are in their 40's.Some people call me Pat others Pete it does not matter to me it just gets my attention.Didn't your daughter take your fabulous picture for you to post she must love you for who you are inside and to me thats what really counts.When they come to you for advice you give it to them from your heart does it matter if your dad or mom it matters because you are part of them and always will be. If your in doubt try asking you maybe surprised at their answer .