Conversation so far:
what are the ranks in the hereditary peer?
The ranks in the United Kingdom are, in descending order of rank, duke, marquess, earl, viscount and baron; the female equivalents are duchess, marchioness, countess, viscountess and baroness.
How else are the ranks in the hereditary peer ranked besides in descending order of rank: duke,duchess, marquess, marchioness, earl, countess. viscount, viscountess and baron, baroness?
Baronets and baronetesses may pass on their titles, but are not peers. A non-hereditary title may belong to the peerage. Peerages may be created by means of letters patent.
What do hereditary peers do with their rankage?
Hereditary peers elected hold their seats until their death, resignation or exclusion for non-attendance, at which point by-elections are held to maintain the number at 92.
Are there any interesting aspects of the hereditary peer article?
Women are ineligible to succeed to the majority of hereditary peerages, and only inherit in the absence of a male heir in the other peerages.
What is the highest hereditary rank?
The highest heredity ranks are duke and the female equivalent duchess.
Is there any other significant interesting factor about the hereditary peer article besides rank, rankage usage, and succession?
In 1532 Henry VIII created the Marquess of Pembroke title for Anne Boleyn. She held in her own right and was ennobled with the same rank as a male Viscount.

Question: how do they get two hereditary titles?
Self-contained rewrite: How do hereditary peers get two hereditary titles?