Hi, I promised I'd come back to you on this, sorry for the delay. I've now got some information from my DH.
The important thing to remember is that the relevant rules that apply are those for third country nationals travelling with or to join an EU spouse.
The EU passed law L158 on April 30th 2004, and each country then passed their own law to adopt it.
For example, the EU law was passed into Spanish law by Royal Decree 240/2007 of February 16th 2007.
The EU law applies in conjunction with the Practical Handbook for Border Guards C(2019) 7131 of October 8th 2019 , revised 28.10.2022 [C (2022) 7591 Final) and issued to all member countries.
Section 2.1.2 of the Handbook is very helpful and sets out the rules and provides examples, the first of which is relevant.
See page 22 of this link. https://home-affairs.ec.europa.eu/system/files/2022-11/Practical%20handbook%20for%20border%20guards_en.pdf
You are still limited to 90 days at any one time in a Schengen country, but you are then free to move on to another Schengen zone country for up to 90 days and so on. Alternatively you could leave the Schengen zone for eg 24 hours and then return. The limitation of 180 days does not apply to EU spouses and family members.
Remember you must be travelling with, or going to meet your EU family member. When you are not, the normal 90/180 days rules apply.
If in doubt, please make your own enquiries in relation to your particular circumstances.