Wouldnt rally know much about property at all - just some people telling us to invest and rent.
Don't just go blindly investing in property because somebody "advised" you so
but in general this is not a bad idea in the current climate, or maybe better in a year or two. What I mean is the sentiment about property is currently very negative, so from a contrarian point of view in might be time if not to invest, but at least start looking into it
However, learn as much as you can about property market first, and about issues involved in renting out a property, and generally about finance. THEN seek professional advice if there is something unclear to you.
It might be an idea in the meantime to move at least some of the money out of Ireland, until you decide what to do with it, or pay off some of your mortgage, still leaving yourselves with enough money to buy another property if you decide to do so.
Is your future wife's invalidity pension not means-tested? If it's not, she can buy the property in her name, as this will help to utilise her standard-rated tax band while her other income is small (assuming her invalidity pension is small).