i have the exact thoughts as you..... to have one more kid so that he will not be alone after we are not here..... that might be the only reason i will have the second kid.... but think from another aspect, if i have more time and resources for him, he might have better opportunity to be a "good" person (financial and personality wise), he will have lots of friends and his own family like wife and kids... he will not be lonely (although possible to be alone)..... additionally, who does not come alone and leave alone in our lives.. .. i think this is a sentimental topic, but the decision is toooooo big..... i truly hope everyone should consider it thoroughly before they make the decision......
yeah i agree it is case by case and needs to see the actual situation. Everyone has his/her choice.
But my view is from the kids perspective it would be better if they could have a companion in their grow up journey so that they can share, talk and love each other.