Disclaimer to start off - this sounds like I'm counting down the days until my DM and MIL pass away. This is absolutely not the case, and I don't want to come across as greedy or entitled. But I am having to do some serious financial planning (because of a medical condition which means I can't get life insurance) so I want to ensure I have understood correctly and don't want to press DM or DMIL on the details too much in case it sounds like I'm just after their money!
My DF died a few years ago and at that point my DM sold the house and downsized. The house sold for £200k and apparently their wills were set up so that my DF's half (£100k) went into a trust so that it is protected and can't be eaten up by care costs if my mum needs to go into a care home etc. Each of his DC have 1/4 of his share so as things currently stand, that is £25k each. My DM has bought another (smaller) home for approx. £150k and kept the £50k difference to supplement her pension, so I think the original £100k of my Dad's half is still in the trust as the leftover £50k cash would have to have been taken from my DM's half. Would that be correct? If so, unless there's a big housing crash (in which case a lot of us will be buggered), can I fairly safely assume that at some point in the future I can expect a minimum inheritance from my DF of £25k? And if say in 10 years' time my DM's house is sold and has increased in value from £150k to £180k, do the relative proportions stay the same and therefore my DF's trust would increase in value by £20k and my DM's half by £10k, or does that whole extra £30k of profit go into my DM's share? (Of course I may at some point also inherit some of my DM's share but she may well need a care home so I'm not assuming anything for now).
Meanwhile my DFIL has also passed away and him and DMIL also had a similar set up with trusts, but my DH only has one DB. DMIL is also about to sell and downsize to free up more cash to supplement her pension. So do the same principles apply here (albeit with the sums involved quite a lot larger) - DMIL's house currently on the market at £530k, so if we assume it sells for £520k, DFIL's half in trust would be £260k of which we would inherit half, so £130k.
Basically I'm trying to work out the extent to which this money is 'guaranteed' to us - even if its in 10 or 20 years' time - because I'm worrying about having a big mortgage, two young DC and not being able to get life insurance. It would be a huge relief to know that at some point in the future, we will definitely get a minimum total inheritance of £x amount. If so, I am then going to try to work out how to write my will to ensure that if I died before my DM, my DC would still be entitled to the inheritance from my DF's trust.
Well done if you got this far and thanks for any advice.