Is this a reasonable request of a family member?

So my child & I live in a rented 2br unit; I am a FT student & have a small amount of work commitments; my child is off to school for the first time in a week.

An immediate family member is selling their home & is hellbent on having the house vacant while it is listed on the market and has gone to the extent of putting all their belongings in storage. I've made the offer of opening our home on a strictly short term basis between settlement of the old house and buying a new home. However the relative has arrived to stay with boxes and boxes and boxes of stuff- taken over my child's room so the child has to sleep with me and neither of us are having a good night's sleep- without a contract on the old home nor knowing exactly what or where their new residence will look like. I've asked for some idea of how long they intend on staying and if they could give me a firm idea of what their intentions are as I need to advise my real estate of an additional occupant (my neighbours are busybodies and will complain to the real estate if I have anyone stay here). The relative is very indecisive on where to from here and doesn't really want to fill out the real estate forms etc to continue staying here. They aren't financial to move into their own rental. I've suggested that my child and I need an established routine and it isn't unreasonable to live in your own home while it is listed for sale.

At this stage this relative has become very upset with me and taken all their stuff and returned to their house and insists they will sleep on a blowup matress until the house sells? Is it unreasonable of me to expect to know what their intentions are or suggest that it is reasonable to live in their home while it is for sale? My child and I can't continue to share a room for an extended period of time.