I'll give you the other side of the story:
I provided free childcare for my SIL (for my DN) after my brother died. I did it for 7 years (from aged 6 yrs). I never got on particularly well with my SIL before my DB died, but as I was the only family member living close enough to her when she was left alone, I stepped up to the plate. (I lived 45 minutes drive from her - the rest of my family lived 2.5 hours away - and her family lived in France!)
I collected him from school on Fri evening, brought him home in uniform and got him to change whilst I made his meal. There was always something missing from his 'weekend bag' - socks, t-shirt, play trousers, trainers, waterproof coat. So I started to buy 'spares' off eBay otherwise I was having to wash his play-clothes each evening, giving him a pair of my socks etc. (I already washed and ironed his school uniform so everything was clean for Monday morning when I delivered him home at 7pm.)
I got comments/instructions:
- I don't bother with ironing
- It's okay for him to wear the same clothes all weekend
- He only has a bath on a Sunday
- Don't comb his hair, he doesn't like it
- He likes to run around/sleep naked and I encourage it
- Don't encourage him to eat vegetables/fruit, he doesn't like them and you are upsetting him
I could remember more - but that 7 years of my life was lovely (because I spent quality time with my DN) and absolute hell because whatever I did that was 'different' was met with a wall of disapproval.
When you look after a child, having spare clothes is essential in my book! One of the lovely things WE did together was to choose what he would like to wear the next morning and lay them out on his bedroom stool. But he would always insist on going home in his Sunday play outfit (including trainers) and I would never see them again.
I had a nick-name for DN which I used when we were ready for doing bed-time routine. My DN asked me never to call him that nick-name in front of his Mum. (A 7 year old shouldn't be so fearful of loving two members of his family in different ways.)
We had made-up games that included my Border Collie dog - it was called "The Ringo Game". I had to ask questions about caring for a dog, and if he got the answer correct, he and Ringo would run round the house in a circle - a bit like doing the conga. We actually HAD to play the "Ringo Game" as I drove him back through peak hour traffic after collecting from school, because that 45 minute journey became 1.5 hours on many occasions. But when we were at family gatherings, Ringo had to be kept away from DN as she didn't trust medium-sized dogs.
The worst time for me was when DN was 9 yrs old (so well into child-care provision at the drop of a hat) and I got a text message (by accident) from SIL which said, "I've just spoken to the SIL from Hell, and she will have him again this weekend. Okay to meet you at 7pm Friday night."
Needless to say, I phoned her immediately and cancelled my weekend child-care.
No apology - nothing! She just told everyone that I had cancelled child-care at the last minute.
My Mum (her MIL) provided 2 weeks free child-care in the summer holidays. My Mum had 9 children and considered that a voice warning (or a certain look) should be sufficient. It came to a head when DN jumped on the furniture, called me eldest brother a liar over chess rules and ignored adult warnings. My Mum sanctioned him by saying "straight to bed and no story reading tonight". It turned out that my DM insisted on him having bath or a 'good wash' every night and he couldn't cope. SIL travelled on a train for 3 hours to collect him.
OP, if you are not happy with your current child-care arrangements then please pay for it! Do not under any circumstances set your MIL up to fail. That is passive-aggressive. You will be looking for anything to mark her down for; you will look for something else that you can criticise or disapprove of. You will destroy any possibility for a positive relationship between your DD and his GPs.
I will leave you with one last thought:
Did your DH choose you as his life-long partner because you are actually a mirror-image of his DM? [A strong, formidable female who controls and manages everything.] Therefore, two formidable females find it very hard for one to step down.