I think you should seek professional advice, perhaps starting with the law firm links I provided. If you are very stressed about that I think you need to find someone who can clearly answer your questions. The volunteers in this form are not professionals who deal with the 3520 and these kind of issues all the time.
In particular I do no know if the 3520 only applies to cash. I said I didn't find anything indicating that, but I don't know.
You present some details that were not obvious it me before that you owned some of the property before your father's death. I don't understand when or how you obtained that ownership.
You should pull together all the details the best you can. Write them down. I would include the dates and % ownership that you obtained personal ownership and a description of the property. Let the potential lawyers know this. For example and making things up something like: a single family home in Country A (or rental property or farm or whatever it was). Parents purchased in 1950 for <cost>. They gave me and my sister 10% (5%) each on April 1 2008. My mother died on March 14, 2022 and [my father inherited her share or her share was split between my sister, my father, and myself]. The property was worth <amount> at that time. My father died June 1, 2023. I inherited X% of his share. The property was worth <amount> on the day he died. Describe the sale process.
Do not stress about this. Just deal with getting advice from a professional. Maybe you missed the deadline. maybe you didn't. It probably doesn't matter much, but ask the professional.
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