Collectively it seems a lot.
What if it you think of it as a "split" on a per child basis between the two families:
Family 1: 1,000chf (or 200chf a day)
Family 2: 1,500chf (or 300chf a day)
From here you can capture:
- time (10 to 15hrs a day aparently)
- workload (wake, wash, feed, entertain, etc.)
If someone was to do all this work by themself, then yes, that's a lot to do. Although, as Swiss in training said, not everyone wants to pay for all of this.
The employer could then pull the "Holiday" card, provide a ski pass for one day, and a night off here and there and they hold the responsibility themselves pulling the hours back to "where they need them the most".
You could 'halve' the total amount of work....... and the price, and therefore it becomes reasonable in both price and workload.
Once all the kids are in bed, it could be a flat 'baby sitting' rate as she'd just be sitting at home watching TV while the parents are out on the lash somewhere.
There are lot of ways to skin the cat, but simply saying it's too expensive without providing any basis whatsoever shows a lack of imagination and credibility.
If the OP has a lot of competition from other baby sitters who would happily work 15hrs a day for 5 days as a 'holiday', then supply and demand would suggest this is a "Take it or leave it" situation, and she should simply deal with it as this is her long term available job.
I wouldn't want to pay 500chf a day, but I also wouldn't want to work my arse off for 15hrs cleaning up after screaming kids either.
I think this offers a pretty fair cost balance.