Dear MarynBill:
Thank you for your post to the Ireland Reaching Out message board.
I have had a look at the Roots Ireland database (subscription site) with no luck for any of the children that you have mentioned being baptised in County Roscommon. It is possible that the parish register has not been transcribed online. I have checked Griffith's Valuation for a Michael Manning from County Roscommon and there is one listing for a Michael Manning in the townland of Breanamore and the parish of Tibohine. However, there are no parish baptisms or marriages showing the names that you have listed for any Manning family.
If you have not already done so and if you have an Ancestry account, you might take a look at the Immigration and Emigration Records and in particular the naturalisation documents. There are several for a Michael Manning--one in particular for a Michael Manning born about 1809 in County Roscommon, Ireland who emigrated to Boston and resided in Somerville. There are also others which are worth looking at. The few that I have looked at all refer to County Roscommon so that there was definitely a connection with the County.
If you have any further questions, please let me know. You can email me directly at: jhalloranryan@irelandxo.com
I will foward your query to a few of our Roscommon volunteers who reside in the area to see if they might be able to shed further light on a possible parish.
Kind regards,
Jane
Jane