We don’t give out information on living people on this website, for privacy reasons, so there’s a limit to what we can tell you about children etc.
However I would check with PRONI in Belfast to see if Albert left a will, as that is likely to give details of his family. A 1996 will isn’t on-line. You need to go to PRONI in person and look up the will calendars. If you don’t find a will listed in 1996, check a few years afterwards as sometimes it takes a year or two for probate to be granted and the calendars are indexed under date of probate grant, not date of death.
You might also get a copy of Albert’s death certificate. The informant may have been a relative.
Neither the 1996 death certificate, the 1949 marriage nor certificates for any children born to that marriage are available on-line. You either have to contact GRONI and ask them to search (for which there may be a fee) or if you can get to PRONI, there are terminals there where you can search for the events. It costs £2.50 to view each certificate. (To search for children, you should enter the husband and wife’s surnames and leave the child’s forename blank. The search should then bring up any children with parents of those surnames).