I dont know if you are still tracing your familiy history but i have a peter muldoon in my familiy tree . I got info about him from the 1901 census. he was living in liverpool married to mary they were both 28 they had 4 children at the time but i suspect there are more. my grandfather was their son john born in 1896. if peter was 28 in 1901 that makes his year of bithr 1872/3. I have found a peter muldoon born24/4/1872 parents john muldoon and catherine fagan but dont know place of birth only ireland.