Robert, I was looking at Debrett's Online, and here is the descent as I understand it:
The second through the six baronets all descend from father to son, but there is a bit of wrinkle with the seventh baronet. His father is Lewis and his grandfather is Colin (b. 1742), who is the second son of the 3rd baronet and a younger brother of the 4th baronet. The descent then continues with the 8th baronet (son of the 7th) and the 9th baronet (son of the 8th and grandson of the 7th).
After the 9th baronet, things get a little confusing. Looking back to the 3rd baronet, besides the 4th baronet and Colin (the grandfather of the 7th baronet), there is a younger son named George (b. 1749). George had a son named John (b. 1779). It is through John's 2 sons, John (b. 1820) and Francois (b. 1823) that we get the 10th thru the 12th (current) baronets. John (b.1820) had a son Edmund (b. 1858) and a grandson Kenneth (b. 1891) Kenneth is the father of the 10th baronet.
After the death of the 10th baronet, we follow the line of Francois (b. 1823). He had a son John (b. 1869) who was the father of the 11th baronet and grandfather of the 12th (current) baronet.
So it appears to be as follows, from the 3rd baronet forward:
1. 3rd Baronet
1.1. 4th Baronet (b. 1740)
1.1.1. 5th Baronet
1.1.1.1. 6th Baronet
1.2. Colin (b. 1742)
1.2.1. Lewis (b. 1788)
1.2.1.1. 7th Baronet
1.2.1.1.1. 8th Baronet
1.2.1.1.1.1. 9th Baronet
1.3. George (b. 1749)
1.3.1 John (b. 1779)
1.3.1.1. John (b. 1820)
1.3.1.1.1. Edmund (b. 1858)
1.3.1.1.1.1. Kenneth (b. 1891)
1.3.1.1.1.1.1. 10th Baronet
1.3.1.2. Francois (b. 1823)
1.3.1.2.1. John (b. 1869)
1.3.1.2.1.1. 11th Baronet
1.3.1.2.1.1.1. 12th Baronet (current)
Hope this helps.
Brooke