You would never have believed my FiL had had any children, let alone the generous number he had. Whilst our's were small he constantly showed irritation and an over zealous care for MiL that she wasn't tired by them. As they grew older, spoke more clearly etc he warmed to them much more. He always had hearing problems and their high voices were out if his range mostly, plus any more than one person talking meant he couldn't follow a conversation. He was old school, but actually a lovely man despite this! My DH is now also experiencing similar hearing problems. He adores our GC but finds the loud noise that accompanies them tiring, trying and disorientating, but is very keen not to become grumpy like his father was in their company. Is this a possible clue in your situation OP? When we take ours out into a clear space, not maybe a noisy swing park, where they can run around and we can chat to one each he comes into his own. Equally getting out huge bits of paper and paints, or similar, where the 2 year old could concentrate and interact with him, whilst you look after the tiny one might help their relationship. I'm all for calling out a childish grumpy old selfish man, if that's what he is, but it is also worth spending time trying to see if in fact there is an underlying problem beyond those assumptions. I also feel sometimes that some grand are keen to wind up OPs further and love the idea of OPs stomping out, leaving, behaving as if they're on EastEnders. You will know OP if he is just a waste if space, or whether he is worth having a sympathetic look at in case his grumpiness is masking an unhappiness of a more forgiveable source.