It depends on the hours as well.
If the pay was right + the kids (the older ones) didn't have many behavioral issues, I would consider doing it.
However it would be tough to do so at more than 40+ hours per week and I would hope there wasn't any household duties required aside from the common sense stuff like cleaning up any messes made and washing up any dishes used.
Even doing laundry for three kids along w/caring for them may be a lot.
This is just my opinion OP, there very well may be other nannies who wouldn't mind a position such as you described.
Good luck to you however, I hope you find that special person!!
