It might be that Patrick is the son of Anne Murphy and bernard mcdermott (born in 1794) and not this bernard mcdermott.
The two Bernards are from the same small village in ireland. Indeed they are from the same townland. Probably nephew and uncle but not 100% sure. I know bernard mcdermott born in 1794 wed in 1829 and that his son patrick emigrated around the time of the famine in 1847. Three of his brothers also emigrated. Their names were James, Michael and John.
Contributor: Michael moore (50713111) •
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Died, in Kendall, Sept. 23, 1895, Bernard McDermott one of the oldest and most respected citizens of Kendall; aged 85 years.
Iowa County Democrat 1 Oct 1896
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On Thursday morning, Sept. 24, Bernard McDermott, one of the earliest settler of Kendall, departed this life at the advanced age of 79 years. Mr. McDermott was in the true sense of the word, a christian gentleman and possessed those sterling qualities which never fail to command esteem and respect. In him the people of Kendall mourn the loss of an upright citizen and the congregation of the Immaculate Conception a faithful member.
His funeral took place on Saturday, Sept. 26, and a large concourse of people in attendance gave evidence of the high esteem in which he was held. The last solemn rite of his new church were pronounced by his pastor, Rev. M.B. Norton, who in few appropriate words, recommended the virtues of the deceased. His remains were interred in the Catholic cemetery at Kendall, but his memory will long remain seen in the minds of those who knew him. His bereaved wife and family have the sincere sympathy of the whole community.
Darlington Democrat 1 Oct 1896

Children of Bernard & Johanna Murphy
James H. petitioner of mothers will living in Kendall
Mary McDermott Brown Belmont Wis. as of mothers death
Michael residence not known as of mothers death
Eliabeth possibly Bessie Kendall as of mothers death
Margaret McDermott Buss living in Mitchell South Dakota as of mothers death
John residence not known as of mothers death
Louis E. McDermott, San Francisco, Calif. as of mothers death

As of 1911 remaining children have Michael declared dead. Mary T. Brown, Bessie McDermott, and Margaret Buss, and petitionier James H. McDermott.

As of 1911 remaining children have Lewis Edward McDermott declared dead. The last the family heard from Lewis Edward he was at San Francisco, Calif. and was employed as a clerk on a steam vessel running to Japan and China, and was about to go on a voyage on such steamer, and since that time, which was more than seven years past, none of the relatives of Lewis have heard from him.

As of 1911 the remaing children have John C. McDermott declared dead. The family last heard from John C. he was at Mitchell, South Dakota and was about to go on a trip to Alaska.