Hi Amitia Wood,
If you are not receiving an income from your employer you will not be contributing towards your National Insurance records for benefit or pension purposes.
Your employer should be able to provide you with further information regarding your National Insurance position whilst you are on unpaid leave.
They can contact the Employers helpline for further advice on this if they are unable to answer your queries.
You may wish to contact the Department for Work and Pensions to ask if you would be entitled to any National Insurance credits whilst caring for your Mother, however this may not be possible whilst living in Spain. You can contact them on 0800 731 0297 for further information. Lines are open 8.30am to 5.00pm Monday to Thursday; 8.30am to 4.30pm Friday.
You can also find information on GOV.UK about paying voluntary National Insurance contributions whilst abroad.
Please see further information in leaflet NI38 within the following link -
Social Security abroad: NI38. This will provide you with further information on paying voluntary National Insurance contributions whilst abroad, and the CF83 also held within that link is the application you would complete if you want to pay voluntary National Insurance contributions.
Thank you