“Lastly, I appoint my said trustees to convey, deliver, and make over to Jacob Dixon, my eldest lawful son, the residue, of my said means and estate, after satisfying the provisions and others above mentioned, and that so soon after my death as my said trustees may have recovered and laid aside sums sufficient for satisfying the provisions, annuities, and others provided by this deed, and the relative or supplementary deed before mentioned, care being always taken that my said eldest lawful son shall not receive less, out of my means and estate, than the sum of 6,000 l . sterling, or the value thereof.”