Hello, my name is ***** ***** I’ll do my best to assist you today.
Please bear in mind as this is an email service and not live chat I may not respond immediately.
In relation to your 2 questions:
1. Child maintenance can be backdated but only to the date of the application as far as I am aware, so it should not be backdated for the last 4 years.
2. When determining maintenance, the court will look to the reasonable needs of the maintenance creditor (the person entitled to the maintenance) against the ability of the maintenance debtor (the person directed to pay the maintenance) to pay. It will also look at the circumstances of "all of the family". In my experience the maintenance claim itself would not affect the property that you own. But if maintenance is ordered by the court and he falls behind on payments, this may result in enforcement proceedings which could then lead to a charge on your property.
So, the key is to present the financial information to the court, and then abide by the court's ruling.
Unless, of course, he disagrees with the ruling (on the basis that it is unjust, or procedurally wrong for example, not that he just doesn't like it) and in this case he has 14 days to appeal.
I hope this clarifies things for you?