If someone dies without a will this is now as dying Interstate. Their are rules (in the UK) that have to be followed in a situation like this and these lay out the order in which family members inherit. First is a surviving spouse/civil partner, followed by children, then back up to the deceased parents then brothers and sisters. If your not one of these, you get nowt.
A simple will, i.e all the estate to one person, is relatively simple and in theory a solicitor is not needed. You can get a simple kit from most stationary shops or WH Smiths. Any solicitor who does wills (and most will because is a good earner) will do a home visit, of course they will charge for it. Your relative needs to have mental competency to create the will.