Can I claim my parent as dependent who stay with us without SSN?

[kkurni]

My parent is staying with us for a year, but they do not have SSN.
Can I add them as dependent on them having SSN?

Is there any alternative to claim them as dependent?

[DoninGA]

To claim someone as a dependent on a US tax return they must have either a Social Security number which is valid for employment or an ITIN issued by the IRS.  If neither, you cannot claim them on your tax return.

[kkurni]

My parent will stay with us for 6 months with tourist visa.

Do you think she can get SSN or ITiN?

[LoganathanB]

Unfortunately no. Your parents should have either SSN or ITIN for you to claim them on the tax return. They should also satisfy the substantial presence test.

Substantial Presence Test