First of all, you must appreciate that this is a UK-based site, and you are going to get most answers from white British people who may not understand the finer points of cultural differences.
That said, from what I have read, the best option would appear to be to resolve the sale of the property that is available, and use the money to secure accommodation for your family.
It is clear that you feel a responsibility for your family - perhaps more than you should, but that is a cultural difference i think - but given that this is how you feel, moving away without your family will cause more issues than it solves.
Whatever you do, try not to take on sole responsibility for sorting everything for your family. It is admirable that you wish to help them, but you are not responsible for adult people, family or not.
And lastly, don;t be hard on yourself, you have achieved an education and secure employment - plenty of people your age have achieved neither.
I hope this helps a little.