Is this legal?
You don't say if you mum left a will, but generally, all children have a right to share in their mother's estate. The sisters excluded should take legal advice, as if the executors try to over-rule their legal rights or shares stated in a will, this can be stopped.
I was driving on a main street and a car came out of the side road and hit my near side. I wasn't injured, but my car was off the road for two weeks when it was being repaired. I use the car for work and also picking up my son from a school that is a fair distance away, but the other driver's insurers are saying it is not essential that I have a car, so are not willing to pay my hire charges.
The argument about necessity is probably not the relevant one. You should not have to suffer being car-less as a result of another's negligence. As long as you hire a modest car, you should get the cost back.
I live in an upstairs flat. The door entry system does not work properly and any repairs by the landlord only last a few days. I have been told that if I were burgled the insurance would not pay out as the security door is wedged open most of the time. Is this true, and what can I do about it?
You should check your insurance policy carefully first of all, and see if there is any provision about security. But that won't solve the larger problem of the door system. You should write to the landlord/factor and state your unhappiness in clear terms, and put on record that the landlord is failing in its duty of security. Ultimately you could take the landlord to court as being in breach of the tenancy agreement, but don't rush into that. Get into dialogue with someone high up in the landlord's organisation. It is in their interest not to be sued for your losses.
My gran lives in a four-in-a-block building downstairs. The boiler used to be in the loft until she got a combi boiler recently. The upstairs neighbour now wants to convert the loft to a living space. My gran is worried this will cause damage to the roof and therefore possible water penetration of her flat.
Her rights depends on whether the title deeds allocate the loft space to one flat or as joint property among two or four of the flats. If the former, the upstairs neighbour can proceed, subject to a building control warrant and possibly planning permission, but must observe due care for your property. If the loft is jointly owned, then upstairs cannot do any work without the consent of all owners and can be stopped, if necessary by court order.