Select records if status column is active or null in SQL Server

I work on sql server 2012 I face issue I can't get partfamilyid that have familystatus active only or active and Null.

so if partfamily have familystatus active then it is ok i need it as 5200.

if partfamily have familystatus active and NULL then it is ok i need it as 3050.

SO partfamilyid 5200 has familystatus Active so it is ok.

and partfamilyid 3050 has familystatus Active and NULL so it is ok.

create table #partsFamily  
(  
    PartFamilyId int,  
    FamilyStatus nvarchar(50),  
    CountStatus  int,    
    FamilyStatusStuff  nvarchar(2000)  
)  
insert into #partsFamily(PartFamilyId,FamilyStatus,CountStatusParts,FamilyStatusStuff)  
values  
(3000,'Obselete',5,NULL),  
(3050,'Active',5,NULL),  
(3050,NULL,2,NULL),  
(3090,'Active',3,NULL),  
(3090,'Obselete',4,NULL),  
(4050,NULL,8,NULL),  
(5200,'Active',2,NULL),  
(5600,'Obselete',4,NULL),  
(5600,'Pending',5,NULL) 

Expected Result as following :

1. PartFamilyId    FamilyStatus      
2.  3050            Active|NULL              
3.  5200            Active