What type of visa should my family apply for to visit Thailand for two months?

Can anyone help? So ive book accommodation and my flights for myself, my husband and my 83 year old father. We travel to Thailand on the 1/1/27 and return back to the UK on the 30/3/27 and booked everything before the Visa changes. I run my own business that I have someone in running while im away. My husband is on 4 months leave and my dad has retired. We all have a decent amount of money in the bank so what Visa do we apply for? We are all over 50. Any help would be appreciated as I dont want to have to cancel. And to add we last visited in May last year