Buying a sibling out of inherited house

My sister came to me recently as she wants me to buy her out of our late father’s Dublin home as she is moving down country. I want to keep this house as my two children who are college going are currently residing in this house along with my sister. I want to take out a mortgage to buy her out but as I have a principal private residence with no mortgage I am being told this would be an investment property. I work in Dublin and commute and am now thinking I might reside Monday to Thursday in this dublin house.

Has anyone any advice on what best way I can do this for my children who will be continuing to live in this house after college. Can I take out a mortgage not an investment one or is that my only choice? As inheritance are you exempt from stamp duty?

Any advice greatly appreciated.

But it is an investment property so, yes, you will need an investment mortgage.

Some lenders will give you a loan secured on your home, but I imagine that the interest rate would be similar to the investment mortgage.

This article suggests that BoI will give you a loan on your home at home loan rates.