What are you girls doing for it?
I'll send a card to my stepson's mother as usual. I'm sure my SO will give me a card on my stepson's behalf too (he's 2.5 so doesn't understand mother's day).
I think the US has adopted the Sunday after mother's day as 'stepmother's day' so we may start implementing that as well! Once my stepson is old enough that will be up to him to decide of course but I'd be lying if I said I didn't hope he'd consider me when making cards at nursery / school haha.
Do your stepkids recognise you at all on this day?