In rejecting a challenge to its jurisdiction made by the sellers of real property to debtors, the court found that debtors were in possession of the property and were equitable owners of it, and that a state court forfeiture action filed by sellers less than a month prior to initiation of debtors' bankruptcy had not advanced beyond the initial pleadings and had not changed debtors' property rights and, therefore, it could exercise summary jurisdiction over the property that was the subject of the parties' uniform real estate contract.