i dunno-depending on how old ds is and how aware he is, i just anticipate people coming up to him before/after the ceremony and saying something about the reception (innocently of course-but you know, "oh you look so handsome-will you save a dance for me tonight?"). in which case you end up with a confused and upset kid.
we attended a wedding several years ago wherein the bride wanted everything to be "perfect" and not take the chance a child might upset the reception (i'de be more concerned with those that take too many trips to the open bar myself

). she had one child as one of her attendants and it was a major issue about that child not being invited to the reception (and we're not talking toddler, the little girl was around 9). her mom put her foot down and said that had the bride spelled it out when asking the parent if the child could participate, mom would have taken everything into consideration and made an educated decision. since that was not the case-either the child was afforded the same courtesies as the rest of the wedding party or they would simply choose not to attend. bride decided it was better to keep the child in (i think more for balance re. photos) and the child attended the wedding and reception with no problems what so ever.
i think you have to go with your gut instinct and not worry about what the in-laws think. i had to take a stand (which i'm sure has me somewhat in the dog house on dh's side of the family) re. dh's nephew's wedding this summer. while i understand that tradition dictates that the wedding is held in the bride's hometown, i think consideration to travelers should be given when planning a wedding. the bulk of the groom's family as well as the bridal party (sibs and fellow students at college in groom's hometown-where the bride has lived full time for the past 5 years) will have to travel over 8 hours (each way) by car for this wedding-which they chose to hold the sunday of july 4th weekend-in a peak tourist destination. the hotels are costly most weekends, and raise their rates plus require a 3 nite minimum for the weekend of the 4th. so in order to attend-out of area travelers will have to book 3 nites, pay for their meals and associated costs to attend a wedding/reception that has been clearly stated will last 2 hours max.-because the bride and groom have opted to have cake/punch only in order to have (1) a higher cost photographer, and (2) a more extensive honeymoon.
when the circumstances became apparant i told dh it was crazy to consider using his vacation time and endure 16 hours of car travel (with 2 kids) for a 2 hour event that would likely cost us over $1500 in hotel/eating out alone (not to mention gas, appropriate clothing for the kids, and finding some activities during the trip to keeps the kids from bouncing off the walls in the car/at the hotel).
i find it amusing that the bride and groom (and groom's parents) are so shocked that the bulk of the rsvp's have come back indicating that long time friends and such will be unable to attend
