Buchans of Perth

[dollard]

I have Alexander Buchan who married Mary Buchan 1767 Jul 5 at Madderty, Perth. They had the following children in Perth; Alexander 1768, Ann 1770, Kathrine 1772, James 1774, Henry 1778, Thomas 1780, and Mary in 1788.
The above Henry married Anne Barber 1810 Feb 28 in St. Vincent, West Indies. They had the following children; Mary born 1810 in Grenada, West Indies, the rest of their children were born in Perth-Henry in 1817, Emily in 1821, Alexander 1822, James 1826, Richard 1832 and Ann 1835. Does anyone have connections to this family?