As a Granny who lives 200 miles from her grandchildren I have no experience of regularly giving childcare. I hope to move nearer and be available to help out in emergencies but I wouldn't offer regular childcare as I feel I'm too old to cope. I was an older parent and became a GP a few weeks before I retired. I have helped out for a few days when my grandson's nursery closed at a time my DS and DiL were unable to take time off and was relieved that my granddaughter was still able to go to her childminder as normal. I enjoyed the time I had on my own with my grandson, but would have struggled if I'd had them both! At the same time I do envy GP's who spend regular time with their GC as they develop a closer bond. In our case both sets of GPs live 200 miles away in different places and the other GP's also have 2 more GC while I just have the 2.
I would be mindful of keeping that special bond alive, though maybe a compromise could be reached - maybe shorter days when you look after him, or maybe alternate weeks during the maternity leave. Of course if your husband has health issues that may affect things too, but I hope you can reach a decision that works for all of you. I'm sure your grandson values his regular time with you and might miss that part of his routine. I was a stay-at-home mum with both sets of GPs living at a distance. My children saw my in-laws more often than they saw my mum as the distance involved was less (and they were more pushy) but I regret not making more effort to see my mum more as their relationship was much less close. As a child I only had one set of GPs from the age of 3, and although there was no childcare involved, we saw them every week and the relationship was really important and I have many happy memories.
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