Not wanting to be judgmental, but absolutely NOT.
My sister and I were pregnant at the same time way back in 1981, my Dad and Stepmum stayed for the arrival of my sisters twins, but then went off for an extended holiday in Australia. I had had a difficult pregnancy throughout, hospitalised several times, and was rushed in again on New Years Eve for an emergency C section. My daughter was born safely, and I soon got over the trauma. But, call me petty, or not, I arranged her Christening a few weeks before they got back to the UK. And to be honest, although I never said anything to them, I never really forgave them in my heart.