Subsequently, with the death of his mother on 13 June 2017, he became the 3rd Earl Mountbatten of Burma.[5] When elevated to the peerage, the first Earl had no son, and the letters patent creating the peerages granted to him were all subject to the following special remainder, in the absence of heirs male: ...to his eldest daughter Patricia Edwina Victoria, Baroness Brabourne...and the heirs male of her body lawfully begotten; and in default of such issue to every other daughter lawfully begotten of the said Louis Francis Albert Victor Nicholas... successively in order of seniority of age and priority of birth and to the heirs male of their bodies lawfully begotten...As a result, since the first Lord Mountbatten never had a son, his elder daughter, Patricia, succeeded as the 2nd Countess Mountbatten of Burma upon her father's death.Should the legitimate male lines of both sisters fail, the peerages would become extinct.[7] The heir apparent is the present holder's only son, Nicholas Louis Charles Norton Knatchbull, Lord Brabourne (born 1981).Source: [11] Quarterly: 1st and 4th, azure a lion rampant double-queued barry of ten argent and gules armed and langued of the last crowned or within a bordure company of the second and third (Hesse); 2nd and 3rd, argent two pallets sable (Battenberg); charged on the honour point with an escutcheon of the arms of the late Princess Alice, namely: the royal arms differenced by a label of three points argent the centre point charged with a rose gules barbed Vert and each of the other points with an ermine spot sable.