The testator owned an undivided interest in two sections of land. Upon his death the heirs made an agreement whereby five of the children (the plaintiffs) and the widow quitclaimed their interest in the one section to the remaining two children (the defendants) who in return quitclaimed their interest in the other section to the plaintiffs and widow. It was further agreed that, upon her death, the defendants were not to share in the distribution of her interest in the land. In disregard of this agreement, however, the defendants claimed a proportionate interest. It was held, in Heinrich v. Newell, that they were estopped to advance any such claim.