He was the fourth son of Thomas Kavanagh of Borris, County Carlow by his wife Lady Susanna, daughter of Walter Butler, 16th Earl of Ormonde.
[1] He married artist Lady Harriet Kavanagh (née Trench) on 28 February 1825.
Their youngest son Arthur MacMurrough Kavanagh was born with vestigial limbs and Lady Harriet insisted he be raised with the same opportunities as their other children.
[2] Following Thomas' death Lady Harriet took their three youngest children travelling in the Middle East for two years.
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