I wouldn't expect it, like your mother does, but to me mothers day is about mothers everywhere, not just your own mum, kwim? So in celebrating mothers day, I celebrate taht my grandmother has given me motherly advice and has treated me like her own child, so I celebrate her too, and usually at least get her a card. I also gave my mum and MIL a card and drawings from my children to celebrate too. Though not because it's an expected gesture, but because I celebrate them as mothers!