Do you like to think objectively?
Yes. I am especially fond of analytical breakdown and comparison. However, like @
Sultan of Beans voiced, I try to use objectivity wisely. I easily acknowledge that my thinking skills are more honed in the subjective realms, because that's what I tend to focus on and care about more, but objectivity is a tool that often helps me.
How traditional can INFPs get?
Probably some could get very traditional, but the determining factor would probably be whether or not the tradition is seen as being in line with the INFP's values or not. If the tradition never crosses a problematic line, they may well keep on with it or even augment it. If it does cross a line, the INFP will probably either change it to make it more aligned with their values or reject it all together.
Personally I especially love holiday traditions with their focus on family, relaxation, appreciation, enjoyment, and decorating so that everywhere feels festive. I appreciate a lot of traditions just for the little bit of variation they provide - like casual Fridays at work. I've also established some traditions of my own. What I mean by changing the traditions to meet one's own values - like I was raised Catholic, and I don't believe most Catholic beliefs, but on Halloween night and All Saints' Day I'll still light a candle and say a few words and spend some time thinking about those I loved who have passed on, because I think it's a good idea to have a day for remembrance of them.
How important is family structure to INFPs?
I can't speak for the group on this one either, and I'm not entirely sure what you mean. For myself, I eventually would like to have a husband and kids, the standard hetero 2-parent model. I had a very happy childhood with my own family being of that model, and my boyfriend did too, so if we end up getting married and having kids I know both of us would like to recreate that. But who knows, maybe that won't happen. Maybe my current relationship won't work out and I'll fall in love with a woman, or maybe I'll decide to be single and adopt a child. I'm not closed to any possibility.
I think I don't really care about family model. I care that the parent feels like they have enough time, energy, and resources to both provide for their kids and to take care of themselves, so I lean towards 2-parent families being preferable, but that's often just not possible. And if one parent feels like they're happy raising a child on their own, then more power to them. I care that the kids have supportive people they can learn from and lean on. The specific structure itself doesn't matter to me as long as everyone's happy and healthy.