YABU..... and I'm probably closer to your current situation than anyone else here.
My DH recently took redundancy from the Army. At the time we were living in Germany and got three weeks notice to return to the UK, no housing in place. I was working too and had to give up my job so I am a SAHM.
DH, DD, me and our dog moved in with my Mum and her dog.
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I do the housework - all of it, including the laundry.
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I do all the childcare as DH's new job means he is out of the house before DD wakes up and is usually in bed before he gets home. DD is 15 months old, so doesn't go to school.
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I do all the cooking.
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I do all the shopping and we pay for it.
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I drive my Mum to medical appointments, collect prescriptions, provide care and do all the things she can't do.
And do you know what - I think every single one of these is fair enough. Because:
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My Mum has taken us in and we are creating more mess, and more laundry. Plus I'd be doing it at home anyway.
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I'm a SAHM. DH works. That's kinda the point of being a SAHM.
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I'd be doing it in our house anyway - so I'm cooking larger portions but it's not an "extra" task - it's a normal one in a bigger pan.
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I do all the shopping because Mum would struggle, and we pay for it because just having us in her house has doubled her gas and electric, and tripled her water bill. You are complaining about paying for the shopping - but you are increasing their bills by at least 50% just by living there. You aren't paying rent you should be paying for the shopping. To complain about that is just "grabby".
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She is my Mum - nuff said really! I was addressing her Christmas cards tonight until 10pm.... She's out at a restaurant. I'm sure you'd complain about that, me, I'm glad she's having a nice time.
If you don't like it - move out. You are not being asked to do anything that isn't fair.
You imply that your SIL wanted you to move in to get you to do all these things. Yet you completely ignore that you will have increased all their household bills, taken up space, made mess and you are home all day. You are already at the school so no extra work there.
Essentially you have all day to yourself (must be nice!), you collect two extra kids from somewhere you are already going, cook double of a meal you'd be cooking in your own home, supervise two more kids homework (but you worked with kids so that shouldn't be difficult) and you pay for shopping. None of this is unreasonable - you are.
As someone in a similar position I think you are ungrateful. Go pay for a hotel - it'll cost you a damn sight more than some shopping, parttime childcare and cooking.