How can I sell my deceased mother's property and not have it seen as a capital gain if, prior to her death, she added me as a joint tenant?

Question Details:

My mother listed me as a joint tenant in her coop prior to her death. It wasn't my desire and I had no financial involvement. She passed away with the desire that proceeds be divided among her 3 children. Escrow says they need to file a 1099 for me. What can I do to have the sale seen as an inheritance, not pay capital gains, and be able to distribute the proceeds to my sisters as an vs. a gift from me? As I understand it, normally the property is valued based on the death of the owner's death. Would that still be the case here? Important Notice