My wife spends more time with my kids than me and hence my kids are closer to her. They share everything with her but not me. This hurts me at times and I feel that they are drifting away from me. Please suggest me how do I avoid this.

This is most likely in your head, and it's pretty common. Suggest you find inclusive family things to do - such as go the SG Carnival, a family walk and icecream (where you treat the family) around Botanic Gardens, or maybe lunch at a family friendly cafe. You could also just take the kids out without the wife for a while - even if just to the park or to the movies. They will get to spend quality time with Daddy, while also giving mummy a break. Try this for a couple of months and see if this changes your opinion, and then report back to us so we know if this helped?