Viscount Mersey heir questions

I have 2 questions regarding the heir to the new (5th) Viscount Mersey.

I know he has 2 daughters (including one just born July 30th) and no
sons. A female can succeed to his secondary title (the Lordship of
Nairne).

Does this mean: 1) the heir presumptive(?) to the viscountcy is his

Graham Truesdale...

Sounds right, assuming his Lordship has no brothers.

uncle David Edward Hugh
(b. 1938) ?

2) the heiress apparent (?) to the Lordship
of Nairne is the Viscount's
eldest daughter (Flora Diana Joan, b.
2003)?

Graham Truesdale...

No. She would only be heiress presumptive, as the birth of a brother
would mean that she was no longer heiress. A[n] heir/ess apparent is
somebody who only has to keep on living in order to inherit.

Please help!

Brooke
bxzi@yahoo.com