1844-1869: Thomas Andrews - the Hidden Years

According to her death certificate, Thomas' mother, Martha, was 32, much the same age as his father, 34, when he was born in 1844.

In November 1845, when he was 18 months old, his father died of a "lingering" illness for which he had presumably gone to Dublin for treatment. Where did he die? Is it documented?
Perhaps through the auspices of the archbishop, his mother was found a post as matron of the Armagh County Infirmary at the end of 1845. This post lasted only a year. Are there any papers in the Archbishop's Office about this?
From November 1846, Martha was without work. One assumes she was supported by her father, William Rogers, which would make sense if this was indeed the proprietor of Armagh's chief hotel.
Thomas received "a private education" - who from? Who would be a likely teacher?

In 1850 when Thomas was 6, his grandfather William Rogers sold up his possessions in Armagh. He is said to have moved to Dublin - did he?

In 1854 when Thomas was 10, his mother remarried, to John Bell, a successful farmer in County Louth. How did they know each other?

One clue is that one of the witnesses at the wedding was John Dransfield - a Newry hotel-keeper. Was there a connection in the hotel trade?

In 1862 when Thomas was 18, his stepfather John Bell was evicted. What happened next? (How old was John Bell? There were dozens of John Bells in the area at the time!)

By the spring of 1869, when Thomas was 25, he was clerk to the Crumlin Road Gaol

How does all this fit?