I am buying my mother's house from him, yet another family that were going to buy it have suddenly come back and offered £5k more. This is extremely near exchange and puts the house over the general house price. She is now going to allow this gazumping and go with the external offer unless i meet the additional £5k. AIBU to think this is unfair behaviour, after all I am family and thought she would be kind enough to keep it in the family as long as she gets fair value for it. I appreciate it is ultimately her home and she wants to get as much money for her retirement but this has really rubbed me up the wrong way and upset me.