I need help with chihuahua dog obedience training?(please!)?

the reason why Ur dogs jump is because they DEFINITELY still puppies they want to play and they want to be at Ur level of height (eye to eye like u prob are with Ur friends) plus they are glad to see u ,dogs sometimes just want to be talked to and cuddled with since theyre still young they can still be trained now what u do about the play biting is that when they bite u say no and gentle put not to gentle pop them on the nose it may sound mean but it teaches them not to do it u may also not want to do this becouse theyre biting to help theyre teeth like babies with there teethers so just buy them puppie teethers if that doesnt help then pop them like i sed ....to help the jealousy have you and ur mom sit in diff. rooms and play with the dogs at the same time but that may be difficult u could also get play toys of the same thing but some diff. and throw them that will help with bonding ,another thing u could do for jealousy and bonding is cuddle with them at the same time one in one arm the other in another and talk to them as much as possible like pet them and its ok or say there name and make a noise and/ or be like -gasp- whats that -gasp- what is that... your dog is barking and growling because he wants to protect u from people he doesnt know......hope i helped srry i sed alot.