My condolences to you!
Much of what you will want to consider revolves around the actual dollar amounts you are receiving.
How much you are earning, how much you are drawing on his pension, and how much you are drawing on his social security.
Here is a TurboTax tool for estimating withholding. https://turbotax.intuit.com/tax-tools/calculators/w4/
Once you determine the entire amount needed to be withheld, you can decide if you want to have it all withheld from one source or distribute the withholding among the three sources.
I’m assuming you have no dependents, so for this year you will still be able to file as married filing jointly and receive the entire amount of the standard deduction. This amount depends on your ages and can be found here: https://blog.turbotax.intuit.com/breaking-news/irs-announced-significant-inflation-adjustments-for-t...
After reducing your taxable income by the standard deduction, you will then want to consider these tax brackets to determine how much you want to have withheld.
Hope this helps!
Cindy
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