Just that, really. We get along well, they love the kids (6&4) but they have never looked after them on their own. Occasionally, they have done babysitting (once or twice a year) in my house. They have taken them to the park a handful of times on their own. They suggested this year that they could take them on a holiday in summer (a week) down to the beach. On the one hand, it sounds great, we rarely have time as a couple and never had a full day together without kids, so it would do us good. The kids love their GP and would love to go. But part of me is worried that GP have underestimated how tiring it is (they are healthy but have the occasional blip due to old age), that they won't be able to keep an eye on both and the youngest might run off into danger (you have to keep all eyes on this one), that after two days they will have more than enough and will resent offering or would just not have the energy to look after them, etc.
The kids have never slept anywhere else either, I don't think they will miss us but have very different bedtime conditions (ceiling light / dark room, music/silence, reading/straight into bed) and I am not sure how they will deal sleeping together in the same room.
I don't know, I'm worried that they will injure themselves or put themselves in danger, either because GP don't reach them on time or because tiredness takes its toll.
I also know that this might be a tricky issue for me because this fear happened in my family, when my GM could not reach my cousin when he run into the road. They had gone out for the day and neither were familiar with the surroundings. I was a toddler myself when it happened (so I didn't experience the trauma directly) but the story has followed me since. No one took anyone on holidays on my family. Days out when older and rarely.
So am I afraid because of my childhood story or is it reasonable to think these are not optimal conditions to take kids on a holiday?