Have name changed for this. And probably am being UR.
DD is 2.6 but has a developmental delay of around 6 months, a speech delay of 8-10months, a physical delay of around 10 months and also a hip dysplasia i both hips. She also has asthma and damaged air ways because of in correct treatment of a chest infection when she was younger.
As a result of all that she needs looking after differently to other children; she can't walk up or down stairs so has to be carried, has to be lifted by her thighs rather than her ankles when having her nappy changed, needs an inhaler 3x daily and is also on a low dose of antibiotics and steriods daily. She's not potty trained and unlikely to be for at least 2 years. I am very PFB about her I admit.
I will not allow anyone under the age of 21 to look after DD unsupervised. I specifically chose a Nursery that only allows the Level 4 and 5 qualified staff to look after children unsupervised and they don't employ under 18s so the L4 people are 21+. I don't allow her to go in cars with anyone under 21 years old, the regular babysitter I use is 23 and if I ever employ a different babysitter I specifically request they're 21+. I have no idea why 21 is the magic number to me.
I'm supposed to be going out for a meal with DH, MIL and FIL next week. My regular babysitter has had to pull out as her partner is working so she has no-one to have her children and doesn't feel confident looking after her 2 + DD at her house on her own due to DDs extra needs. And the agency I usually use only has under 21s available to sit that night which I'm not comfortable with. My DM is working a nightshift that week or she'd happily step in and have DD at hers for the night.
I've told PILs that DH can go and I'll stay home with DD. MIL suggested SIL look after DD, and I immediately said no she's too young. SIL is 18 (19 in February), and 7 and a bit years younger than DH, she's also had no experience looking after young children before so even without DDs extra needs I wouldn't feel comfortable with her looking after DD.
MIL is saying I'm being silly and she might as well cancel the whole evening as it was meant to be a "night off" for both me and DH. She wants to know what I think will happen if SIL babysits and is making out I hate SIL (which I don't, she's lovely just "too young" to look after my PFB). I've told her about not being comfortable with SIL looking after her and how I am about the Nursery and stuff but MIL says it's stupid and I need to get over it as there maybe a time when someone under 21 needs to take care of DD.
So AIBU? And if so how do I get over my anxiety about this?