We should perhaps make clear that Cromartie is not currently in
abeyance. It reached that state on the death of the grantee but was
soon terminated in favour of the eldest daughter. The current earl has
two unmarrried sons in their twenties, and a few other male heirs in
line, so it's unlikely to become abeyant again soon. But it is
unfortunate that the grant did not specify a more straightforward
remainder. The title featured in an article on peerage grants to women
in the 2008 edition of Debrett:
"The wife of the 3rd Duke of Sutherland, in the year her husband
succeeded to his title in 1861, obtained a grant of the earldom of
Cromartie [sic] with remainder to her younger children and to which
were attached the Cromarty estates. The grant was not as carefully
worded as that of Lucas of Crudwell however and fell into abeyance
between the daughters of the 2nd Earl. This was soon terminated in
favour of the elder daughter and the title has descended to the
present (5th) earl in the male line. He has a son and heir apparent,
but should a future earl produce only daughters, it would result in
another abeyance which may not be so speedily terminated."