There seems to be some confusion on this thread between mandatory disregard and discretionary disregard.
Mandatory disregard means that the Local Authority
has to disregard (not count) the house in the financial assessment. If the spouse of someone who has moved into a care home is still living there, or if there is a relative who is disabled then the house is a mandatory disregard and cannot be used towards the care home fees.
What this means for you
@Cazcaz is that so long as
either your dad or your sister is living in the house, then it will be disregarded and you can continue living there. The Local Authority doesnt have any choice about this.
If
both your dad
and your sister stop living there, then the house ceases to be a mandatory disregard, but if you are still living there yourself you can apply for discretionary disregard. This means that the Local Authority can decide whether to allow the house to be disregarded or not. In this case, things like how long you have lived there, whether you were a carer and whether you have put money towards the house can all be used as part of your application.
Id like to repeat, though, that discretionary disregard would only happen if neither your dad, nor your sister were still living there.