Check each one against your own record — you may be due more than one type, but you are paid the higher benefit, not both.
If you are 62 or older and your spouse receives retirement or disability benefits, you may qualify on their record. At full retirement age a spousal benefit is generally 50% of the worker's benefit; it is reduced if claimed earlier.
A surviving spouse may qualify at 60 or older, at 50 or older with a disability, or at any age while caring for the deceased spouse's child under 16 (or disabled before 22). SSA says survivor benefits range from 71.5% to 100% of the deceased spouse's benefit, depending on claiming age.
If you are 62 or older, unmarried, and were married for at least 10 years to someone entitled to benefits, you may qualify on their record. If divorced for at least two years, you can apply even if your former spouse has not filed.
If your former spouse dies, you may qualify as a surviving divorced spouse if you were married at least 10 years, are 60 or older (50 or older with a disability), and are single — unless you remarried after 60.
Disability benefits, and benefits for a disabled widow or widower from age 50, depend on work history and medical rules. Check your own record at SSA rather than assuming eligibility.
Children, and in some cases a spouse caring for a qualifying child, may receive benefits on a retired or disabled worker's record. Rules depend on age, disability before 22, and school status — check the SSA family benefits page.
SSI is a separate, needs-based program for people with limited income and resources, including people 65 or older. It is not the same as Social Security retirement benefits, and eligibility is decided by SSA.
Use your my Social Security account and the official SSA benefits pages to check eligibility. Survivor benefits cannot be applied for online — SSA directs you to call. This story is general education, not personal advice.