Whether your wife co-signed or not she always is counted in your family size.Yes you might be eligible..
i have somewhat same situation... i checked with IRCC Call centre on mine..
2018- got married ....combined income $72K...(total family size 4)
2019- sponsored wife & Parents ...combined income $100k (total family size 4)
2020- co-signing for in-laws ...combined income $100k (total family size 6)
IRCC person said Since my wife DID NOT CO-sign the application hence our family size for 2018 would be 4...so i am keeping my fingers crossed for eligibility...