I couldn't breastfeed my first baby. The birth was traumatic and both of us nearly died, so my milk supply shut down, and the baby was in SCU for a few days, during which time I was mostly unconscious, and the milk didn't come back. I bottle fed, and it was absolutely fine - in fact I bottle fed the second baby too, as I found that despite being in NCT and really wanting to breastfeed the bottle actually worked well for us as a family.
I would have massively resented being assumed to be lazy, or any implication that I wasn't doing the best for my babies. My husband knew that there was no alternative with the first one, and that it was my decision anyway. He was happy to join in with feeding both of them, so we shared the sleepless nights and both bonded with both children. If he had brought his mother into the situation in any way I would have thought it really inappropriate. I believe that as the mother it was my decision to do things the way that worked for me (although any choice in the matter was taken away as it happened). As the father, maybe he had a right to an opinion, but if we had disagreed on that I think he should have conceded to me. Outside of that, it had nothing to do with anyone else, including grandparents, and unless I had asked for advice I would have been furious with him for involving others.