Hi Isle of Man
Do the three children want the house? Or do they want cash?
Joint ownership of a house often leads to huge problems. It can also be the cause of people falling out.
If your father gives you the house now, you will pay 1% stamp duty, no CGT and no CAT. You will pay the various home taxes as owners of the house.
If you sell the house for €300k at some time in the future, you will be liable for CGT on the increase in value.
If you father leaves the house to you in his will when it is worth €300k, there will be no CGT or very little as it was his principal private residence for most of his life.
If your father sells the house now for €210k and gives you €70k each, there is no stamp duty, no CAT, no CGT.
You are all free to do as you like with the cash.
If neither you nor your father want the house, then it is best to sell it now.