You should look to Trinity College for your genealogist although I'm sure there are many reliable ones. Under
Eneclann the genealogy division of Trinity you will find information. I know two who work out of there but last time I asked were too busy to take on any more.
I don't think there were would be anything different from roots as the Kildare genealogy office would have got any information they have from local Parish records. Roots H.O. is in Kildare, and they have research abilities but you pay more than for just the records. At least you would know they are reliable.
Are the family RC or Protestant, Holden sound english so could be Protestant. If so you can access the actual
parish registers yourself. These are held in Dublin
at the churches own Representative Library to 1899. You can do your own research. It take a long time so prepare for that if you want to do it. Its never on one page or just open a book but solid research on your part. They are very helpful there. It is free just your time or for you to pay a genealogist for their time. I would put aside two full days there as they close 2 hours for lunch.www.ireland.anglican.org/information
(RCB Library) is where you go. There is a map. I took the bus and found it very convenient from in front of the National Library #14. Just lets you off close by and same opposite side for return. Its about 1/2 hr. in busy traffic. Make sure they are not closed for what they call Bank Holidays over there - our
long weekends. You have to leave the building for the 2 hr. lunch. They are open in the evening one night but can't remember. Check the website. You have to go either to the pub in one direction or the hospital cafeteria for lunch. Also the National Library closes as well on these holidays and has hours for specific types of research so if you are going in the evening you need to check the website.
I went to Ireland to do my husband's family as I was quoted a minimum of 500 Euro's and I felt at the time that covered my airfare. I've been several times now.
If RC you would go through the microfilm at the National Library, you can do this yourself. RC records are in local custody. Don't necessarily expect a 'happy to see you' for
either of the dominations. If you want to visit the church it will be locked now, so write first or phone once you are
there and make an appointment. Most Parish's are on the internet now. The graveyards are free to visit and take a digital as they even take good pictures in the rain. They take best pictures in cloudy or shady conditions. Also take some white tissue paper and some black wax crayons as even those where the carving is poor and hard to get a picture you will be able to do a rubbing. You can then iron that onto fabric and frame them if you are so inclined. You can also use black paper and a gold crayon like they do in church for the metal inscriptions.
Will you have a car or taking tours. I have the name of a good fellow that met me one afternoon to drive me around an area, a personal tour. It was about 90E but cheaper than renting a car which when I was on my own the car rental wouldn't let me although I had booked ahead. I will wait for an answer to that questions before chatting on.www.athy.ie www.kildare.ie/heritage/historic-sites
St. Michael's church (this indicated to be Church of Ireland but not sure as rc is in the web name?)email@example.com
Rev. Cliff Jeffers, The Rectory, Church Rd. Athy 0598631446
Have you tried the rootsweb-Kildare county info?www.igp-web.com
+ Kildare (look for archived photo's)www.censusfinder.com
Different information depending the counties.