He was s of Maj Sir John Weston BROOKE 3rd Bt and Rosemary NEVILL 1912-79 d of Percy Llewelyn NEVILL 1877-1927 (gs of 4th Earl of ABERGAVENNY 1792-1868) and his w & 1st cousin once removed Marjorie NEVILL 1886-1945 (gd of 1st Marquess of ABERGAVENNY 1826-1915). He m 1984 Tanya Elizabeth d of Antony Thelwell MAURICE of Lloran, Robertson, NSW, Australia, and had a son and two daus as above.
He was heir presumptive to his brother the 4th Bt. That place is now taken by his son JOHN WESTON b 23 Feb 1992, who is married with a dau: https://groups.google.com/g/peerage-news/c/msHj85C168c/m/3NeIdFYbCAAJ
There are no other heirs to the title.