Which one is grammatically correct? Please explain the reason behind it.

1) I am blessed to have you.
2) I am blessed having you.

Question

Which one is grammatically correct? Please explain the reason behind it.

1) I am blessed to have you.
2) I am blessed having you.

Answer

1 is correct. For 2, you'd need something to complete the sentence, e.g. I'm blessed, having you as my partner/friend/helper/assistant/ leader. 
Hope this helps :)

Answer

'I am blessed to have you' is more common.  However, it's possible to say, "I'm blessed having you as my friend."  Both the gerund and the infinitive can follow 'bless' without a change in meaning.

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