DNA works very well when we talk about descendants of one man like Abraham so all people who claim that they are descendants of him must carry one Haplogroup only and not several Haplogroups.It's impossible that one man has various Haplogroups.( Pure blood / Paternal ).
But if we talk about tribe it's possible that comprised various peoples and ethnicities as tribe in the ancient time consider like modern state comprised of various peoples and races from all over the world.( mixed blood / No Paternal ).
e.g :
descendants of Abraham : One HP ( Paternal)
descendants of Aharun : One HP ( Paternal )
descendants of Imam Ali : One HP ( Paternal)
descendants of John Kennedy : One HP ( Paternal)
Canadians : various HP
Americans : various HP
British : various HP
Saudi Arabians : various HP
Indians : various HP
Israelis : various HP
Actually you are mistaken... even someone who is half jewish/half chinese will belong to the haplogroups of their parents. One maternal (mtDNA) and one paternal (Y-chromosome). You inherit your genes from both parents not just one.
Haplogroups cover large sections of the population for example Haplogroup J covers peoples from the Middle East, Turkey, Caucasus, Italy, Greece, the Balkans, North and Northeast Africa.
Even when you break Haplogroup J into smaller haplogroups (J*, J1 and J2) Each one covers massive segments of the population over several ethnic groups.
When you add Haplogroups from mtDNA you get an even more complex view of human relationships.
For example Haplogroup M1 includes people from Ethiopia and Somalia, through the Middle East and over to India and Haplogroup R is also found in a majority of people from the Middle East as well as West and East Eurasia. It is the the most common Haplogroup in Europe. And when you break down Haplogroup R you find the same deal as with Haplogroup J
People intermarry and otherwise "mingle" genetically since the dawn of time. As soon as Abraham married a woman his kids got both haplogroups from mom and dad.
The only way to have an "ethnically pure" haplogroup would be via profound inbreeding. Only if Abraham's sons married only Abraham's daughters would Abraham's lineage be a genetically pure one. It's basic genetics.
wa:do
ps... decendants of John Kennedy are not a haplogroup, there isn't enough genetic variation to make them a unique haplogroup.
http://en.wikipedia.org/wiki/Turkic_peoples