Normally visit for 4/5 months and get a 6 month multi entry visa. As I look after my mother now, I am only visiting for 6 weeks, 42 days, do I need a visa still and if so what one please?
TLDR : Answer Summary
For a 6-week visit to Thailand, you have a couple of options regarding your visa. You can either apply for a single entry tourist visa at the Thai consulate in your country, which would give you 60 days upon entry, or you can enter Thailand under the visa-exempt entry that allows for 30 days. If you choose the second option, you can extend your stay by 30 days for a fee of 1900 baht at the immigration office. It may be worth considering which option best suits your travel plans.