b. 14 Feb. 1783, 2nd surv. s. of Humphrey Sibthorp (afterwards Waldo Sibthorp) (d. 1815), of Canwick Hall, Lincs., and Susannah, da. of Richard Ellison, of Thorne, Yorks. and Sudbrooke Holme, Lincs.; bro. of Coningsby Waldo Waldo Sibthorp MP. educ. Chiswick; Brasenose, Oxf. 1801. m. 21 Feb. 1812, Maria, da. and coh. of Ponsonby Tottenham, MP, of Merrion Square, Dublin, 4s. suc. bro. 1822. d. 14 Dec. 1855.