To be fair to DP most of the time the children are left alone is because of he is fetching and carrying for one of the other children.
This weekend schedule will be something like this;
Friday PM - 20 mins round trip drive to do school run 1, wait for half an hr to do school run 2(I would normally do this one, but I am working later this Fri), bring kids home, 30 mins later, 20 mins drive to do school run 3. 20 mins drive to pick up 1 DSC from evening job. 20 mins drive to take 1 DSC to a party. I will do 20 mins drive to pick up DSC from party.
Sat AM - DP does 1-2 hrs work in the early morning, then he will leave with 2 DSC to take them to 2 clubs and return 1.5 hrs later. 20 mins drive to pick up DSC1 from club.
Sat PM - DP may do 1 hr work in the office. 3 hrs round trip to take DSC1 to sports match he plays in.
Sat eve - DP is committed to a social event. I can go with him or stay at home with kids. If I do, he will be gone for 4 hours.
Sun AM - DSC1 will probably want to see boyfriend, so this involves 20 min drop off. DP will then come back and set off for another 3 hr stint with DSC for sports. He may well tie in picking up DSC from boyfriends on the return journey.
Like I say, this is what I know about at the moment, when they arrive, they may decide they want to visit friends or have friends over or may need something collected from Mum's etc.
So, you see, at the moment(this changes dramatically at certain times of year), he isn't working much at the weekends, but it is the running around for the children that is taking the time.
While he is driving 1 child, I am left at home with 4 children, 3 of them being step children. DP could get DSS to go in a mini bus to his sports events but because DP likes the sport, he wants to go and leaves me with the girls one of which wants to do drama and DP keeps putting off organising it for her. 