Based on what you've outlined, why not consider a long-term family visit visa.
You can get one for 2 years validity.
If you can secure one, you'll be allowed unlimited entry into the UK for the duration of the visa validity. You'd still be limited to a maximum of 6 months for each visit, but I doubt that will be any issue for you.

The application fee will be slightly more, but would save you the time and extra expense of multiple Visa applications.

Food for thought..