To sponsor partner and children to join you in UK to live with you permanently or your spouse just want to visit you in UK, there are multiple options available depending on your circumstance.
spouse visa FLR
Applying for spouse visa extension in UK, it is worth to read the frequently asked questions. The FAQs discuss UK spouse visa extension fees, checklist, list of required documents, UK spouse visa extension financial requirements, proof of address for spouse visa extension and spouse visa processing times. You can find information on why spouse visa application are refused and what to do if your spouse visa application for extension or entry clearance has been refused. Also, this section discussed the English language requirement and letters address to you and your partner for the last 2 years (also called proof of living together for spouse visa). General questions and answers about UK spouse visa, main requirements, English test for partner visa and what to do if visa is refused, length of visa and FLR.