Stevenson families or descendants related to them

I am looking for descendants of Charles Maxwell Stevenson,as Charles Maxwell Stevenson was exeutor of Gilbert Stevenson's will.Gilbert stevenson died on 7 March 1898 at Ballywalter & is buried at Christ Church Carrowdore graveyard.Chrales Maxwell Stevenson of New Street,Donaghadee was a Wine & Spirit Merchant  & Manager of The Savings Bank at Donaghadee in 1846.I am wondering if  Charles Maxwell Stevenson was related to Gilbert Stevenson in any way,or what connection was he to Gilbert Stevenson who was born in 1812 ,& resided in County Down all his life as far as I know.Gilbert Stevenson was married to Fanny Scott & the only children that we are certain of are : James Stevenson 1839,Thomas Stevenson 1840,Agnes Stevenson 1842 & Adam Stevenson  1845,who all emigrated to Lyttleton,Christchurch,New Zealand in the 1860's.Thomas Stevenson married Eliza Jane Clarke on 22 August 1861 in Ballywalter,& Thomas Stevenson who was a farm labourer arrived in Lyttleiton,Christchurch,New Zealand with his wife & one child on the "Mermaid" on the 27 December 1862 from London,so their child would have been only a few months old when they left Ireland.If anyone has any information pertaining  to any ancestors to the Stevenson family from that area please post the information to my e-mail address :- zakchris@clear.net.nz

Thank You

Alister Smith.