I think Mum and sister do just now - housing benefit - although that part is the lowest as houses up here aren't much more than about £100 a week, income support plus severe disability element plus both are on highest care DLA, mum is on highest mobility and sister is on lower mobility. They also get cold weather money when it snows - good as they can't afford to use more than two heaters normally.
It will be dropping in August to around £150 a week plus housing benefit. Sister will be getting around £300 a month I think but not sure. Apparently they might be able to claim more but they are already trying to move mum onto ESA and she's pretty much terrified - the form is very odd, asking her if she can pick up a cardboard box or type on a keyboard etc.
Mum takes multiple uncontrollable tonic clonic seizures, also BPV which at it's worst leaves her unable to move without vomiting, chronic ear pain and infections, chronic IBS, multiple allergies, asthma and anxiety issues due to past issues (abuse as a child then rape and abuse again as an adult through marriage and NHS)
Sister has multiple learning difficulties (like general stuff plus dyspraxia, dyscalcula), is severely autistic (verbal but only to those she knows, and she can't always hold a conversation), very agressive, no idea of social norms and boundaries (19 and pulled her pants down in the post office to check if her period had started yet). Will never live on her own and will probably be stuck in her mind as a wee girl for her entire life.
Both really require 24/7 care and what money they get very rarely goes on extras - i.e. cinema 1 or 2 times a year, swimming 1 or 2 times a year - much of the money goes on washing powder, clothes for sister, taxis to and from hospital (£60 each way as mum not fit to take bus after seizures and noone to drive her home). Mum's teetotal.. Neither of them really leave the village much if they can avoid it. Last time we went for a meal (in Wimpy) sister threw a glass of coke at me and poured another in my mum's handbag.. Sister's respite also charges £10 per night plus sister has to pay for food bought outwith the centre - the staff are quite, clever, in that they usually take everyone out for meals and get them to pay.. Last time Mum was in hospital and I was unable to care for sister (tried it once, ended up with her nearly breaking my elbow) they charged £75.
I admit all three of us have smartphones that my mum pays for but they are beneficial in that my mum can note her meds and medical info on hers, use it as a distraction re. anxiety, use it to contact me etc. We also have Sky + . Do go on holiday but that is funded by the SVDP as is much of Christmas - they get a food parcel and normally some money.
FWIW I know both do want to work - sister wants to be Miley Cyrus 
and Mum's a trained chef, but would rather work with people or foster disabled children.
£500 doesn't solve their lives but it does make things a little bit easier I suppose - and even then they struggle.
Initially when we first ended up on benefits we did live on £100 a week - and couldn't afford food, clothing or electric - the meter used to go "zoot" and we'd be plunged into darkness until my mum could top it up!
The only reason they get that money is because they are both so disabled and it's not really something anyone should desire or feel jealous of. It's not like they can use it for anything fun is it..