On 15 January 1787, he married firstly Dorothy St Aubyn, daughter of Sir John St Aubyn, 3rd Baronet.[7] She died in 1830, and Barrett-Lennard married secondly Georgina Matilda Stirling, daughter of Sir Walter Stirling, 1st Baronet on 20 June 1833.[7] He had seven sons and four daughters by his first wife as well as one son by his second wife.
Their fifth son, Edward Pomeroy Barrett-Lennard, emigrated to Australia where he established a large estate named after the one on which he had grown up.
Barrett-Lennard died aged 96 and was at this time the most senior member of the baronetage.[7] His oldest son Thomas represented Maldon and having predeceased his father for a year,[8] Barrett-Lennard was succeeded in the baronetcy by his grandson Thomas.[9]
Coat of arms of Sir Thomas Barrett-Lennard, 1st Baronet
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- Crest
- Out of a Ducal Coronet Or, an Irish Wolfdog's Head per fesse Argent and Ermine charged with an Escallop, barways nebule Gules and Sable
- Escutcheon
- Quarterly, 1st and 4th, Or on a fesse Gules three Fleur-de-Lis of the first (Lennard); 2nd and 3rd, per pale Argent and Gules Barry of four, counterchanged (Barrett); all within a Bordure wavy Sable
- Motto
- Pour bien desirer (The Noble Aim)
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