The Convention of The Baronage of Scotland 
Male Heir
FORMAL USAGE:
Roderick Shand of Pitscot, younger (abbreviated to yr or ygr)
Roderick Shand, younger of Pitscot (also historically accurate, but can cause confusion by splitting the surname.)
Note 1: If the baron is Ian Shand of Tallieban, Baron of Pitscot, his son is Roderick Shand of Tallieban, yr. All these usages apply only if the baron has taken the territorial name-title.
Note 2: If a Baron has NOT been recognised with a territorial designation by the Lord Lyon it is WRONG for the son to use this style.
FACE-TO-FACE CONVERSATION:
Younger of Pitscot
Young Pitscot
Roderick
IINTRODUCING ONE PERSON TO ANOTHER:
Roderick Shand of Pitscot, younger
Roderick Shand, younger of Pitscot
Roderick Shand of Pitscot
START OF LETTER:
Dear Younger of Pitscot
Dear Young Pitscot
Dear Roderick
SIGNATURE:
Roderick Shand of Pitscot, yr (in practice, the yr is often omitted)
R.C.H. Shand of Pitscot, yr
Roderick's wife takes the territorial designation: Lucinda Shand of Pitscot, yr
(in practice, the yr is usually omitted in her case).
TOGETHER THEY ARE:
Roderick and Lucinda Shand of Pitscot, yr
THEIR CHILDREN ARE:
Mr. Hamish Shand
Miss Henrietta Shand
