Were you ever married in a foreign country? the US recognizes valid marriages in a foreign country. if not see a lawyer because you have been misfiling all these years.
if you are legally married and your spouse consents, you can file a joint return. If she doesn't consent, since it seems you lived apart for the last half of 2024 then if you paid more than 1/2 the cost of keeping up a home for yourself and your children for 2024 you can file as head of household, otherwise married filing separately.
