I'm trying to help my sister figure out the best approach to a situation, and I would appreciate input from you folks. She currently owns a condo about 1.5 - 2 hrs away from the town where I live with my DH and our Mom also lives in this town. DSIS would like to move back to our town for a variety of reasons. She is somewhat underwater on her condo, but has good earning capacity and is able to pay her mortgage. She doesn't have a lot of cash on hand. She is daunted by the question of whether she should buy a new house first, or sell the condo first, and if she sells the condo first, where does she live while she house-shops? If she buys a new house first, how does she cover both mortgages? Her condo is in a desirable area and should not be difficult to sell or rent. She has three pets, and the two dogs are not really housebroken, so renting somewhere would be a bit of an issue. Mom is allergic to animals, so living with her for a bit is out of the question, and my house is tiny without even a second bedroom. She probably currently has enough cash to either make a 10% down payment on a new house, or pay the shortfall on her current mortgage after she sells, but not both. Should she wait until she has saved more cash? DH thinks if she works closely with a Realtor, the Realtor could help her do both a buy and sell closely timed, since the Realtor would be motivated by the potential for commission on two properties. Any suggestions? Thanks in advance.