The Maughold parish register has some of their family details. Others would be in Ramsey registers which you can see on LDS film at any Family History Centre. FHCs also have censuses etc., and there are many in NZ. See under Church of Jesus Christ of Latter Day Saints in the phone book.
The town of Ramsey is partly in Maughold parish, and partly in Lezayre, and many Ramsey people used Maughold Church.
Maughold parish register burials:
Alfred Aldyn Lamothe SPENCER aged 2yr 6mo, Ramsey olim Port Lewaigue, buried Jan 25 1882.
Ada Margaret Reid LaMOTHE aged 62 years, Port Lewaigue, Maughold, buried 14 Mar 1951.
Hugh Stowell LaMOTHE aged 79 years, Thie Lewaigue, Port Lewaigue, Maughold, buried 19 Apr 1955.
Marriages in Maughold par reg:
Fredk John Dominique Lamothe & Ann Cowell married 28 Apr 1831. Ann, a minor, by consent of Lieut Governor.
Pilcher Ralfe & Anne Susanna Lamothe married 18 Jun 1831. Pilcher Lieut RN. Both from Ramsey.
John Henry Frederick Spencer & Cath Rose Lamothe married 11 Jun 1839. John Henry Frederick Spencer surgeon.
13 Jan 1859
Hugh Ashworth STOWELL Full age, Bachelor, Clerk in Orders Dhoon Parsonage, [father] Hugh Stowell, Clerk In Orders, and
Annie Isabella LA MOTHE Full age, Spinster, Old Cross, [father] Frederick John Dominique La Mothe, Advocate.
10 Sep 1863
John Corlett LAMOTHE Full age, Bachelor, Advocate, Ramsey, [father] F J D Lamothe, Advocate, and
Sarah BANKS Full age, Spinster, Ramsey, [father] Thomas Banks, Broker.
3 Apr 1866
William JOHNSON, 42, Widower, Merchant, Richmond Surrey, [father] Henry Johnson, Merchant, and
Catherine Rose LAMOTHE, 24, Spinster, Ramsey, [father] F J D Lamothe, Gentleman.
Baptisms in Maughold par reg:
CHAUNCEY Theresa S Eunice daur of William Snell Chauncey & Rose Theresa Lamothe, Parish Church 12 Jul 1808. "Private baptism at Bedminster,Somerset 19/2/1807. Received now"
LAMOTHE John Henry [son of] Frederic Lamothe/ Margaret Corlett [bapt] Parish Church 29 Aug 1815. Private baptism
LAMOTHE Frederick Cowell Frederick John Dominique Lamothe/ Ann Cowell Parish Church 16 Nov 1832
LAMOTHE Henry John Frederick John Dominique Lamothe/ Ann Cowell Parish Church 19 Jan 1834. Private baptism.
LAMOTHE Annie Isabella Frederick John Dominique Lamothe/ Ann Cowell Parish Church 7 Jun 1835. Private baptism. Father an Advocate.
LAMOTHE Fredk John Dominique Frederick Lamothe/ Margaret Corlett Parish Church 21 Nov 1805. Private baptism
LAMOTHE Anne Susannah Frederick Lamothe/ Margaret Corlett Parish Church 4 May 1808. Private baptism. [Father a Doctor].
LAMOTHE Margaret Eliza Frederick Lamothe/ Margaret Corlett Parish Church 9 Mar 1810. Private bapt by Rev John Bridson, Rector of St Bride.
There are a number of wills listed on Brian Lawson's index which can also be seen at a FHC and are usually very informative compared to those from other places.
http://www3.telus.net/lawson/wills/la-will.html
Sue