Info Request

If he died over 10 years ago, isn't it a little late for them to try to shake you down?

http://www.finance.cch.com/pops/c50s10d190_PA.asp has the PA intestacy laws.

Was there ever any probate court proceeding to settle the estate of your former boyfriend back when he died?

http://www.expertlaw.com/library/limitations_by_state/Pennsylvania.html states:
Under Pennsylvania law, an unemancipated minor (a person under the age of eighteen who is not totally self-supporting) may file suit within two years of his or her eighteenth birthday. Unless a longer period is otherwise provided by law, an emancipated minor must file suit within two years of the date the injury occurred.

I'd also like to ask how title to the property was taken when you boght it with him. Were you joint tenants or tenants in common? Joint tenants each succeed to the share of any decease joint tenant but tenants in common who die without a will leave their interest to their heirs. Even assuming it was tenants in common, those kids of his have been over 18 for more than 2 years and if they wanted to make an issue out of it they should have done so before now.

If you are having trouble establishing clear title, you can get an attorney to file an action to quiet title, and you can specifically extinguish any claims by those heirs who failed to act within the statutory time.

I hope this information is helpful.