There is no friendship between a muslim and kafir, it is impermissible. how can you have love for one who doesnt love Allah swt? by all means show kindnesses and invite to Islam, but as for taking them as a friend, eating with them, asking from them, joking with them and having alliance in any way is clearly impermissible. As mg says, you may on the face of things get on but you dont know what is in their hearts, never will a kafir love a muslim, never, not if you are truly upon the haq, but they may indulge a munafiq (not referring to you fa), even in my family, i can tell deep down in peoples hearts there is not love for the muslims, May Allah swt guide them to the straight path,there is emnity and disavowal between us, as Prophet Ibrahim (as), says in Qur'an, until the last day, this is clear manifest proof of the issue.