Tracey - you seem to be having a nasty run with your family lately! i agree with Bron - i think a lot of the time when comments are made about your choices in life it's a reflection of dissatisfaction of their own choices.

you are a great mum, and choosing to work doesn't mean you are any less of a mum than a SAHM. it's not about the volume of time you spend with your children (and from what you're saying, you're working your hours out so that you and DH have as much time with your kids as possible) - it's the way that time is spent. it really sounds as though your sister is just bored over where her life is at the moment, and sour grapes can be pretty ugly!

and as for your mum backing her up, maybe there's still some sour grapes from the last lot of issues...