Hi PM,
I agree that u r in a sticky situation. I heart really goes out to you!! Somemore, it's a pre-term bb.
Frankly, if I am u, I would insist on not helping at all..no trial..no nothing. Not that I'm not being helpful. But we're talking about looking after a pre-term bb, on top of ur own young bb too. And u r a 1st-time mummy, not an exp. nanny...
Normally, even if our mum or MIL (who r exp. in taking care of bbs) takes care of 2 kids, they would also request assistance in the form of maid to help out.
Else, I feel it's really terrible for u to juggle 2 bbs, hsework, ur hubby's expections, ur SIL's expections, lost of freedom & personal time etc....In fact looking after a bb alone, I already can hardly breath! Think I'm getting more & more bad-tempered! Always snap at my hubby.
Did ur SIL really search for other help before going to you? Think u r the easy way out for her. I.e. cos she can save on infantcare fees, nanny fees, go over to ur plc as & when she likes it, can work late & not worry about rushing to pick up her bb etc.
Better think twice before u agree to help her out. There might b issues in the future that could lead to quarrels, esp when bb is concerned. Imagine u wanna spend more time with ur boy/hubby, but still have to look after ur SIL's bb.
Y not tell her u try out for 3 days trial? 3 days is enough to c if u r able to cope or not. Or mayb suggest to ur SIL to get a maid to help ur MIL to take care of her bb?
No offence, but u r also a 1st time mummy. No previous exp at all. I can already foresee a lot of troubles for u in the future if u take on ur SIL's bb.