Yes you have to enter the SSA-1099 for him on your Joint return. The ones for the children only go on their returns if they have other income to report. If that is all they have then nobody reports theirs.
If he got a SSA-1099it is not ssi. You don’t get a ssa-1099 for ssi, only for regular SS and SSDI.
To enter the SSA-1099 Try going to the search box by My Account and type in SSA-1099 or Social Security Benefits. That will give you a Jump To link to take you directly to it.
OR
Enter a SSA-1099, SSA-1099-SM or RRB-1099 under
Federal Taxes on the left side
Wages and Income
Then scroll down to Retirement Plans and Social Security
Social Security (SSA-1099. RRB-1099) - click the Start or Update button
