Marital property is property acquired by 1 or both parties during the marriage, however titled. That is the wording of Maryland Family Law Article section 8-201. Who signed the deed does not decide it. The date of acquisition does.
Section 8-201 also includes any interest in real property that the parties hold as tenants by the entirety, unless a valid agreement excludes it. Read your deed to see how you hold title. Ask your title company or attorney what the wording means for you.
The section keeps four things out. Property acquired before the marriage. Property acquired by inheritance or gift from a third party. Property excluded by a valid agreement. Property directly traceable to any of those sources.
The section also defines the family home. It is property used as the principal residence, owned or leased by the parties, and occupied by them with a child. Section 8-208 lets the court decide possession and use of the family home regardless of how it is titled.
Next step: write the date you married and the date you acquired the house. Gather the records in the table below. Ask your attorney how tracing applies to your house.