But when Dave and Liene Penny told their kids, they got so excited that they managed to sell their house in less than a week - using just paper and felt-tip pens.
On finding out they were moving, Ella, eight, and Tomas, six, got straight to work and made 40 leaflets with a hand-drawn picture of their four-bedroom property in Taunton, Somerset, along with a phone number for "Daddy".
The leaflets read: "If you know anybody who wants to buy a new house phone them up and say 'French Wier Avenue is for sale'."
The children began by giving the leaflets out door-to-door and put a box outside their home, where people could leave their contact details. Just four days later, they got two offers for the asking price of £250,000.
A deal was agreed in six days, with a retired couple who received the leaflet in church. This meant that Dave, 47, and Liene, 32, saved £4,500 in estate agency fees - and were able to move into their new five-bed home quicker than expected.
Translation agency owner Liene was quoted in the Daily Mirror saying: "We are amazed. They took the flyers to a bring-and-buy sale and started handing them out. We are very proud. As adults we are too shy to be so bold – but not the children, it paid off."
Tomas added: "We did a lot of thinking and spent an hour making everything. I might be an estate agent one day!"
By Hayley Minn