My mum has told me in the past that when she and dad decided that 3 was enough after my youngest sister was born, she had to grieve. In particular she said the moment immediately after the baby is born when she felt that rush of unconditional love unlike anything she'd ever felt before, was such a magical moment that the idea she would never have that again made her feel quite sad. I think she has just focused on enjoying us at every age we are, doing different things, planning holidays, and now that we are all in our twenties I think she is very much looking forward to being a nana