Who is a dependant?
Your partner, meeting the criteria below, would be classed as a dependant:
Your husband or wife
Your civil partner. This means you are a couple who have registered your partnership to gain formal legal recognition of your relationship. For information about partnerships in countries outside the UK that are treated as civil partnerships, see the UKLGIG website.
Your unmarried partner or same-sex partner. You need to have been living together in a relationship similar to marriage or civil partnership for a period of at least two years. You need to be able to provide evidence of this.
Other close family members, for example a brother or sister, are also welcome to join the programme provided that their UK Visa status permits this.
In all cases, you must both be at least 18 years old when you arrive in the UK.
You must intend to live together throughout your partner/close relative's stay in the UK.
Your partner/close relative must not intend to stay in the UK longer than the period you are given.
Further information can be obtained via https://www.ukcisa.org.uk/Information--Advice/Visas-and-Immigration/Dependants.