Warm home discount for adult dependents

My previous supplier gave Warm Home Discount for having my adult dependant disabled son living with me but it seems you don’t… can anyone confirm that it’s only given if the bill holder receives benefits and doesn’t include the rest of the household, thank you

The rules are listed here and here. Not all suppliers work to the same criteria. Some offer to wider groups than the Ofgem minimum, so it’s quite possible to get it with one supplier and not another.