If you do not have a Will in Scotland, your estate is divided according to the rules of intestacy.
These only apply to moveable assets - that is everything except houses, flats and land.
Therefore any other houses and land you own (including your buy-to-let properties), and all the cash etc. left from Rights will be distributed in the following strict order of succession:
It then goes on to uncles/aunts and other more distant relatives. But the important point is that your wife or husband is very low on the list. Your nieces and nephews may have better rights to your free estate than your surviving spouse. All the cash remaining may go to relatives (Laughing Heirs) whom you have never met. If no-one can be found then the Scottish Government gets it.
If you are a buy to let investor with no Will your properties are likely to end up in your free estate. If you have children, they will inherit these properties in preference to your surviving spouse, even if they are very young at the time. This could result in an unnecessary inheritance tax bill and make the properties difficult to manage as young children do not have legal capacity. If you are married with no children, your parents, brothers and sisters, (or their children if they have died before you) will inherit your buy to let properties in preference to your husband or wife. If you have an unmarried partner, they have limited rights, which do not include the buy-to-let properties.
If that is not what you want the practical solution is to draw up a Will.
For further help and legal advice about this matter please do not hesitate to get in touch with one of the Solicitors at Fergusson Law.