Thank you everyone for all your feedback.
Ms Southworth, one of your guesses is correct.

I think Rebecca picked up the word politics from Margaret. It's probably a new word to her!
Presea, good point about Lucas. I think Christopher has easier to deal with Lucas than Rebecca because he's always known about Lucas existance and his father has chosen him over Lucas before whereas his mother has "chosen" Rebecca over him.
But yeah naturally it's inevitable that Lucas will show up at Southfork sooner or later...You will see how their first meeting will go then...
Sanda, you'll find out soonish if anyone falls asleep on Margaret's book.
Silvie, I am glad that you're still keeping up with this story as well.
Okay so now it's time for another update:
Meanwhile downstairs in one of the guest rooms were Donna and Ray tucking Margaret in. Ray picked up a book and said, “Are you sure you don’t want me to read to you?”
“Yes dad, I can read you know,” Margaret replied.
“I know that, I just thought that you might enjoy having someone read to you?”
“Thanks dad but no thanks,” Margaret collected the Nancy Drew book from her dad’s hands. “I’m used reading silently by myself. I mean it’s only little kids who need someone to read to them.”
Ray sighed. “Okay if you’ll say so. Goodnight then daddy’s little Angel,” Ray hugged Margaret.
“Goodnight daddy,” Margaret then hugged Donna. “Goodnight Mommy.”
“Goodnight Margaret,” Donna replied before she broke the hug. “Now remember what I’ve told you. Nine-thirty is the light supposed to be out.”
“Nine-thirty?” Ray exclaimed. “But Donna, isn’t that a little late bedtime for an eight year old?” Ray objected. “I mean Lucas is normally asleep at eight.”
“Who’s Lucas?” Margaret asked and both her parents answered at once.
“Your cousin,” Donna replied.
“Your brother,” Ray replied.
“Huh? How can he both my brother and my cousin?” Margaret asked clearly confused by the situation. Ray and Donna exchanged a look.
“Um…it’s complicated,” Donna said.
“Yeah we’ll explain it to you some other time, ok?” Ray promised.
Margaret nodded, “Okay dad. So how long could I read now?”
“Nine-thirty like your mother said.”
“Yeah and don’t you try reading with your flash light under the cover Margaret. Since I can tell when you do. Nine-thirty I’ll be back to check on you and then I want the light to be out,” Donna said.
Margaret smiled, “Yes mom.”
“Good, sweet dreams,” Donna said before she closed the door to the guest room she shared with her daughter. They then started walking back towards the living room. Once they were out of earshot from their daughter Donna turned to Ray and said, “Why did you have to bring up Lucas for?”
“Well he’s my son,” Ray replied. “Why did you say he’s her cousin for?”
“Because we both know he’s really Bobby’s son.”
“Only biologically and Lucas doesn’t know that.”
“He doesn’t?” Donna asked surprised.
“No Jenna and I thought that it was best for him not to know,” Ray explained.
“Best for whom Ray?” Donna asked sternly. “Best for you or for Lucas?”
“Best for Lucas of course,” Ray replied. “So if Margaret asks again I want you to tell her he’s her brother…”
“But Ray…”
“No buts Donna. Remember we’re only in this situation since you choose to walk away when you were pregnant with my child…”
“I know
that but I never told you to find another family to replace us with.”
“Well I did and frankly that’s none of your business.”
“No I guess it’s not, but still I’ve never lied to Margaret about who her father is. What’s going to happen the day when Lucas finds out?”
“Donna…”
“I know, I know, I’m putting my nose in where it doesn’t belong. But still since you’re asking me to lie to our daughter, I think you owe me some sort of explanation.”
“Okay, Jenna and I have agreed to tell him some day when he’s older…”
“How much older?”
“Oh I don’t know. We haven’t really discussed it, maybe when he’s 13 or 18.”
“I see, so I guess I’ll have to tell Margaret then…” Donna sighed. “But I am not sure how she’s going to take it. I mean she and Lucas are about the same age, so what if she believes you were cheating on me with Jenna?”
“I haven’t thought of that,” Ray sighed.
“No of course you haven’t. Luckily for you, I have so I won’t tell her until I absolutely have to. I mean as long as she and Lucas don’t meet it doesn’t really matter now does it?”
“No I guess not,” Ray shrugged his shoulders.
“I mean I don’t want to confuse her unless I absolutely have to,” Donna insisted.
“I can understand that,” Ray nodded. “Oh and Donna?”
“What?”
“Margaret’s really lovely. You’ve done a good job raising her so far.”
“Thanks Ray,” Donna smiled warmly at him.