Can i split my husband union pension as he his disabled and mostly in hospital or rehab most of his income goes for his care ?

It would depend on what kind of pension it is and whether you are over or under 65. The CRA has information on what kinds of pensions are eligible for splitting on their website: https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/pension-income-splitting/eligible-pension-income.html

Here is our FAQ on Pension Income Splitting: https://turbotax.community.intuit.ca/replies/2647840