Yikes, had such a busy day (DP's Neurologist, blood tests, college work and visiting my Gran), I forgot that I had even started this thread. Sorry, I fecking hate when people start threads and don't come back to them. Am annoyed with myself for doing it!
To answer a few questions / ponderings - DP's folks can't afford the repairs on their car. Are on pensions and have no spare cash. At all. We would pay for the repairs / a second-hand car, but have a holiday coming up and need spending money - that sounds horrid, but it is booked, non canx-able, so if we don't go we will lose a good bit of money. We could help them out in about 2 months, just not right now. DP's Dad does not want to go that long without driving.
I absolutely agree with other posters. I don't think he should be driving. He will not have his eyes seen to. Has had a few knocks. Won't tell his wife this, so she insists he is totally okay to drive. If we even suggest to him that perhaps he ought not be driving, at least until he has his eyes tested and gets new glasses etc, he will freak the fuck out.
Insurance excuse will not work, as DP's Mum has suggested that they transfer his insurance over to our car.
We do have two vehicles for a reason - DP's van is owned by his employer, so we don't ever use it for non work related purposes. So technically we could get around without the car, but tbh, I would not feel right about it, and would worry that he would get a bollocking at work, if they found out. His Mum knows this too, so am still a bit cross at her for putting him on the spot. Oh, and I don't drive, so DP's folks will use that as a reason why we don't need a second vehicle.
Will take on board the advice upthread and just say 'no, that won't work for us'. We will be in the bad books for aaaages with DP's folks and his siblings, but we will just have to deal with that. Any tips on how to encourage FIL to have an eye test / stop driving though? This does worry me.