Thomas Bruce, 1st of Wester Kennet, Pitfoulden and Cruicket. is the son of Sir Robert Bruce, 3rd Baron of Clackmannan according to the Charters, and not a Broase:
No. 9 - 2 May 1389 -Thomas obtains Kennet from his father .— Charter of Robert de Bruys of Clackmannan and Rate to and in favour of Thomas de Bruys, his son, whereby " for good services" he grants the said Thomas the lands of Wester Kennet and others for payment to his said father of a silver penny yearly. In the history of Noble British Families, part 3, p. 15, it is stated that Robert de Bruce died about this period, and the next Charters of resignation were probably made by the possessor of the estate on succeeding thereto.
No. 11 - 10th June, 1393 — Charter by Robert de Bruys, Lord of Rate and Clackmannan, to his " beloved son, Thomas de Bruys," and his heirs, and assigns of an annualent of ten merks, payable furth off his lands of Tullygarth, lying in the county of Clackmannan, and that in consideration of a certain sum of money paid to him, the said Robert de Bruys, in his urgent necessity. To be holden of the said Robert de Bruys and his heirs redeemable on payment of the sum of 25 merks.
No. 12 - 18th February, 1399 — Crown Charter of Resignation and Confirmation by King Robert III., ratifying and confirming the Charter No. 9, granted by Robert de Bruys to his son, Thomas, of the lands of Wester Kennet, Pitfoulden, and the Cruikitland, all lying in the county of Clackmannan. From this time the estate of Kennet continued separate from that of Clackmannan, and although the families continued on the most intimate terms, and the heiress of Kennet, in 1568, married one of the cadets of Clackmannan, the estates have never been united. https://archive.org/stream/collectionstowar1868clac/collectionstowa...